Alphabetical Dictionary of Number Words

expression	meaning
numeracy	The noun "numeracy" means "the capacity to understand and work with numbers."
a	The indefinite article "a" means "one (1)." Usage: The indefinite article "a" should be used before a consonant sound, and the indefinite article "an" should be used before a vowel sound. Example: "Enclose an envelope with a stamp."
a-	The metric prefix symbol a- (metric prefix: "atto-" ) denotes a multiple of ten to the negative eighteenth power (10^-18 = 1E-18 = 0.000 000 000 000 000 001) as defined by Le Système International d'Unités (SI).
ace	1. The noun and adjective "ace" means "one (1)." An "ace" in parlor games is "a playing card, die, or domino that represents the number one." An "ace" in golf is "a hole made in one stroke," also called a "hole-in-one." An "ace" in racket sports, volleyball, or handball is "a point made on a serve without contact by the opponent."
	2. The noun and adjective "ace" means "of first (1^st) or high rank or quality."
	3. In military aviation, the noun "ace" means "an aviator who has destroyed five (5) or more enemy aircraft." More generally, "ace" means "one who excels at something."
affirmative	The adjective and noun "affirmative" is a logical value. "Negative" and "affirmative" are sometimes used as a binary logic pair.
algebraic number	An algebraic number is a number that can be expressed as a root of a polynomial equation with integer coefficients. Examples include 0, 1, i, 2^½, φ, -3.456, 7+8i, 9·e^i·π/4, etc. See also "Algebraic Number."
all	The pronoun and adjective "all" means "the whole of" or "every member of."
almost	The adverb and adjective "almost" means "slightly less than the specified amount."
American System	The "American number naming system" or "American System" is commonly used in North America and many other places to name very large and very small numbers. The "American System" is derived from the earlier "Chuquet System." The "American System" uses a Latin-based numeric prefix to denote a one-plus-an-integer power of one thousand (1,000 = 10³ = 1E+03), thus: "(prefix)illion" = 1,000^(1+prefix) = 10^{3×(1+prefix)} Example: In the "American System," one billion = 10^3×(1+2) = 10^3×3 = 10⁹ = 1E+09 = 1,000,000,000. See also Number Naming Systems.
an	The indefinite article "an" means "one (1)." See usage note at "a."
annual	The adjective "annual" means "recurring once (1) each year." See also "yearly."
Apéry's Constant	"Apéry's Constant" is an irrational number approximately 1.202 056 903 160. See also "Apéry's Constant."
Archimedes' Constant	"Archimedes' Constant" (symbol: π {Greek lower case letter pi} ) is the ratio of the circumference of a circle to its diameter. π is a transcendental number approximately 3.141 592 653 590. An Egyptian scribe named Ahmes (about 1680-1620 BC) described a (then several hundred year old) calculation of π to be 256/81 = 3.160. Greek mathematician and scientist Archimedes (287-212 BC) estimated the value of π to be 211875/67441 = 3.141 635. Chinese mathematician and astronomer Tsu Ch'ung Chi (430-501 AD) refined the value of π to 3.141 592 650. See also "Archimedes' Constant" and "Pi."
atto-	The metric prefix "atto-" (prefix symbol: a- ) denotes a multiple of ten to the negative eighteenth power (10^-18 = 1E-18 = 0.000 000 000 000 000 001) as defined by Le Système International d'Unités (SI).
azygous	The adjective "azygous" means "occurring singly (1) and not as a pair (2)."
B	The symbol "B" represents a logarithmic power measurement in bels.
baker's dozen	The compound noun "baker's dozen" means "thirteen (13)."
barely	The adverb "barely" means "only slightly more than a required minimum."
base	The noun and adjective "base" means "a number notation system based on the hyphenated suffix number." Thus, base_ten (base_10) is the common decimal positional number notation system. See also "numeral."
base eight	The compound noun and adjective "base eight (base_8)" means "a number notation system based on the number eight (8)." The modern octal or base eight positional number notation system uses the numerals 0, 1, 2, 3, 4, 5, 6, and 7 to represent the integers zero through seven. See also "base."
base five	The compound noun and adjective "base five (base_5)" means "a number notation system based on the number five (5)." See also "base."
base sixteen	The compound noun and adjective "base sixteen (base_16)" means "a number notation system based on the number sixteen (16)." The modern sexdecimal or base sixteen positional number notation system uses the numerals 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, and F to represent the integers zero through fifteen. See also "base."
base ten	The compound noun and adjective "base ten (base_10)" "a number notation system based on the number ten (10)." The common decimal or base ten positional number notation system uses the numerals 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 to represent the integers zero through nine. See also "base."
base twelve	The compound noun and adjective "base twelve (base_12)" means "a number notation system based on the number twelve (12)." See also "base."
base twenty	The compound noun and adjective "base twenty (base_20)" means "a number notation system based on the number twenty (20)." See also "base."
base two	The compound noun and adjective "base two (base_2)" means "a number notation system based on the number two (2)." The modern binary or base two positional number notation system uses the numerals 0 and 1 to represent the integers zero and one. See also "base."
bel	The noun and adjective "bel" (symbol: B ) is a logarithmic comparison of power levels representing "a ratio of ten (10)." Two (2) bels equal a power ratio of one hundred (100), and three (3) bels equal a power ratio of one thousand (1,000).
bi-	The Latin-based numeric prefix "bi-" means "two (2)."
biannual	The adjective "biannual" means "recurring twice (2) per year."
biathlon	The noun "biathlon" means "an athletic competition consisting of two (2) separate events."
bicentenary	1. The noun and adjective "bicentenary" means "a group of two hundred (200)."
	2. The noun and adjective "bicentenary" means "a period of two hundred (200) years."
	3. The noun and adjective "bicentenary" means "a two hundred (200) year anniversary."
	4. The adjective and noun "bicentenary" means "two hundredth (200th) in rank or order."
bicentennial	1. The adjective and noun "bicentennial" means "recurring every two hundred (200) years."
	2. The adjective and noun "bicentennial" means "lasting two hundred (200) years."
	3. The noun and adjective "bicentennial" means "a two hundred (200) year anniversary."
bicentennium	The noun and adjective "bicentennium" means "a period of two hundred (200) years."
bicentiquadragesimal	The adjective "bicentiquadragesimal" means "based on the number two hundred forty (240)." See also Base Number Systems.
bicentisexquinquagesimal	The adjective "bicentisexquinquagesimal" means "based on the number two hundred fifty-six (2⁸ = 256)." See also Base Number Systems.
bicolor	The adjective and noun "bicolor" means "having two (2) distinct colors."
bicycle	The noun, adjective, and verb "bicycle" means "having two (2) wheels."
biennary	The noun and adjective "biennary" means "a group of two (2) or a period of two (2) years."
biennial	1. The adjective and noun "biennial" means "recurring every two (2) years."
	2. The adjective and noun "biennial" means "lasting two (2) years."
	3. The noun and adjective "biennial" means "a two (2) year anniversary."
biennium	The noun and adjective "biennium" means "a period of two (2) years."
bigamist	The noun and adjective "bigamist" means "a person who is married (usually illegally) to two (2) (or more) spouses at the same time."
bigamous	The adjective "bigamous" means "being married (usually illegally) to two (2) (or more) spouses at the same time."
bigamy	The noun "bigamy" means "(usually illegal) marriage to two (2) (or more) spouses at the same time." See usage note at "polygamy."
bilateral	The adjective "bilateral" means "having two (2) sides."
billiard	The noun and adjective "billiard" means "multiplied by ten to the fifteenth power (10¹⁵ = 1E+15 = 1,000,000,000,000,000)" in the modified Chuquet number naming system.
billion	The noun and adjective "billion" means multiplied by ten to the ninth power (10⁹ = 1E+09 = 1,000,000,000) in the American number naming system, but means multiplied by ten to the twelfth power (10¹² = 1E+12 = 1,000,000,000,000) in the Chuquet number naming system. See also Large Numbers.
billions and billions	The expression "billions and billions" means "an astronomically large number." This expression was popularized by American astronomer Carl Sagan (1934-1996).
bimillenary	1. The noun and adjective "bimillenary" means "a group of two thousand (2000)."
	2. The noun and adjective "bimillenary" means "a period of two thousand (2000) years."
	3. The noun and adjective "bimillenary" means "a two thousand (2000) year anniversary."
	4. The adjective and noun "bimillenary" means "two thousandth (2000th) in rank or order."
bimillennial	1. The adjective and noun "bimillennial" means "recurring every two thousand (2000) years."
	2. The adjective and noun "bimillennial" means "lasting two thousand (2000) years."
	3. The noun and adjective "bimillennial" means "a two thousand (2000) year anniversary."
bimillennium	The noun and adjective "bimillennium" means "a period of two thousand (2000) years."
binal	The adjective "binal" means "based on the number two (2)." See usage note at "binary." See also "base two", Integer Powers of 2, Base Number Systems, Base Number Notation.
binary	The adjective "binary" means "having two (2) parts." See also "base two", Integer Powers of 2, Base Number Systems, Base Number Notation. Usage: A numeral system based on the number two (2) is properly called "binal." The more common term "binary" is also appropriate since a binal digit has two (2) possible binary states: zero (0) or one (1), FALSE or TRUE, low or high, etc.
biped	The noun "biped" means "an animal with two (2) feet."
bipedal	The adjective "bipedal" means "having two (2) feet."
bis-	The prefix "bis-" means "two (2)." See also Numeric Prefixes Used In Chemistry.
bisect	The verb "bisect" means "to divide into two (2) usually equal parts.
bit	1. In archaic American use, the noun "bit" means "one eighth of a dollar ($0.125)."
bit	2. In computer terminology, the noun "bit" means "a single (1) binary unit having two (2) possible states." "Bit" is a contraction of "binary digit."
biyearly	1. The adjective "biyearly" means "recurring every two (2) years."
biyearly	2. The adjective "biyearly" can also mean "recurring twice (2) per year."
both	The plural pronoun and adjective "both" means "two (2) of two (2)." See also "all."
byte	In computer terminology, the noun "byte" means "a set of eight (8) binary units having two to the eighth power (2⁸ = 256) possible states. A byte can be used to represent a single alphanumeric character. A byte is equal to eight (8) bits, four (4) crumbs, or two (2) nibbles.
c-	The traditional metric prefix symbol c- (metric prefix: "centi-" ) denotes a multiple of one one-hundredth (1/100 = 0.010).
cardinal number	A cardinal number is a nonnegative integer, e.g., 0, 1, 2, 3, 4, 5, 6, 7, etc. See also Number Names and "Cardinal Number."
Catalan's Constant	"Catalan's Constant" is a real number approximately 0.915 965 594 177. See also "Catalan's Constant" and "Catalan's Constant."
cent	The noun "cent" (symbol: ¢ ) means "divided by one hundred (1/100 = 0.010)." In currency, a "cent" is "one one-hundredth of a dollar ($0.01), euro (€0.01), or other monetary unit." Usage: The plural of "cent" is normally "cents," but the preferred plural of the euro "cent" is "cent."
centenarian	The noun and adjective "centenarian" means "one hundred (100) years of age or more."
centenary	1. The noun and adjective "centenary" means "a group of one hundred (100)."
	2. The noun and adjective "centenary" means "a period of one hundred (100) years."
	3. The noun and adjective "centenary" means "a one hundred (100) year anniversary."
	4. The adjective and noun "centenary" means "one hundredth (100th) in rank or order."
centennial	1. The adjective and noun "centennial" means "recurring every one hundred (100) years."
	2. The adjective and noun "centennial" means "lasting one hundred (100) years."
	3. The noun and adjective "centennial" means "a one hundred (100) year anniversary."
centennium	The noun and adjective "centennium" means "a period of one hundred (100) years."
centesimal	The adjective "centesimal" means "based on the number one hundred (100)."
centi-	1. The numeric prefix "centi-" means "one hundred (100)." This prefix is derived from the Latin cardinal number "centum (C)."
centi-	2. The traditional metric prefix "centi-" (prefix symbol: c- ) denotes a multiple of one one-hundredth (1/100 = 0.010).
centigrade	The adjective "centigrade" means "having one hundred (100) steps or intervals." The "Celsius temperature scale" was previously known as the "centigrade temperature scale."
centillion	The noun and adjective "centillion" means multiplied by 10³⁰³ in the American number naming system, but means multiplied by 10⁶⁰⁰ in the Chuquet number naming system. See also Large Numbers.
centioctogesimal	The adjective "centioctogesimal" means "based on the number one hundred eighty (180)." See also Base Number Systems.
centipede	The noun "centipede" literally means "having one hundred (100) feet." A "centipede" is "an insect of the class Chilopoda."
centivigesimal	The adjective "centivigesimal" means "based on the number one hundred twenty (120)." See also Base Number Systems.
centurion	The noun "centurion" literally means "one who commands one hundred (100)." A "centurion" was "a Roman officer commanding a century, an infantry unit of about one hundred (100) soldiers."
century	The noun "century" means "one hundred (100)." Most commonly, "century" means "one hundred (100) years." Usage: The Christian Era began with the year 1 A.D., thus the Twenty-First (21^st) Century includes the years 2001 through 2100. In contrast, the Twenty-One Hundreds (2100's) include the years 2100 through 2199.
chiliad	The noun "chiliad" means "a group of one thousand (1,000)" or "one thousand (1,000) years."
chiliagon	The noun "chiliagon" means "a plane figure with one thousand (1,000) sides."
chiliahedron	The noun "chiliahedron" means "a solid figure with one thousand (1,000) faces."
Chuquet System	The "Chuquet number naming system" or "Chuquet System" was devised by French physician and mathematician Nicolas Chuquet (1445-1488), and it is still widely used today. The "Chuquet System" uses a Latin-based numeric prefix to denote an integer power of one million (1,000,000 = 10⁶ = 1E+06), thus: "(prefix)illion" = 1,000,000^(prefix) = 10^6×(prefix) Example: In the "Chuquet System," one billion = 10^6×2 = 10¹² = 1E+12 = 1,000,000,000,000. See also Number Naming Systems.
cinque	The noun "cinque" means "five (5)."
cipher	The noun "cipher" means "zero (0)."
complex number	A complex number is a number that can be represented as an ordered pair consisting of a real number and an imaginary number. A complex number may be expressed as a+b·i, where a and b are real numbers and i is the imaginary unit. The complex number can also be represented as a plane vector r·e^i·θ, where r = (a²+b²)^½, θ = tan^-1(b/a), and i is the imaginary unit. See also "Complex Number."
compound quantity	A compound quantity is a quantity expressed in two or more different but related units of measure, such as dollars and cents or hours, minutes, and seconds. Usage: Currency with a decimal subunit is usually represented as a decimal number, e.g., $139.64 CAD, $1,060.00 MXN, £62.39 GBP, €89.53 EUR. Dates in year, month, and day number may following one of several date formats: 2000-12-31 (ISO 8601), 31/12/2000 (d/m/yyyy), 31/12/00 (d/m/yy), 31/12 (d/m), 12/31/2000 (m/d/yyyy), 12/31/00 (m/d/y), and 12/31 (m/d). Time in hours, minutes, and seconds may following one of several time formats: 19:30:00 (ISO 8601), 19:30 (hh:mm), 19.30 (hh.mm), 19h30 (hh"h"mm), 1930 (hhmm), 7:30 p.m. (h:mm a.m./p.m.), 12:39.36 (m:ss.ss). Angles in degrees, minutes, and seconds are usually followed by their suffix symbols, e.g., 39° 50′ 08″ N.
count	1. The verb "count" means "to enumerate by assigning sequential integers."
	2. The verb "count" means "to tally by counting."
	3. The noun and adjective "count" means "the act of counting."
	4. The noun and adjective "count" means "the total number of objects in a set."
countless	The adjective "countless" means "a very large number of individuals or discrete objects."
couple	The noun and adjective "couple" means "two (2)." Usage: When describing discrete objects, "couple" always means "exactly two (2)," as in "a couple birds." When describing continuous quantities, "couple" usually means "approximately two (2)," as in "a couple hours."
couple-three	The slang expression "couple-three" means "at least two (2) and at most three (3)."
crore	The adjective and noun "crore" means "one hundred lakh or ten million (10,000,000 usually punctuated 1,00,00,000 in India.)"
crumb	In computer terminology, the noun "crumb" means "a pair (2) of binary units having two to the second power (2² = 4) possible states. A crumb is equal to two (2) bits or half (1/2) a nibble.
d-	The traditional metric prefix symbol d- (metric prefix: "deci-" ) denotes a multiple of one tenth (1/10 = 0.100).
da-	The traditional metric compound prefix symbol da- (metric prefix: "deka-" ) denotes a multiple of ten (10).
dB	The symbol "dB" represents a logarithmic power measurement in "decibels."
dea-	The nonstandard prefix "dea-" denotes a multiple of ten to the thirtieth power (10³⁰ = 1E+30 = 1,000,000,000,000,000,000,000,000,000,000).
deca-	The prefix "deca-" means "ten (10)." See also "deka-," Prefixes & Words Based On Greek Number Names, and Numeric Prefixes Used In Chemistry.
decad	The noun and adjective "decad" means "a group of ten (10) members." See also Prefixes & Words Based On Greek Number Names.
decade	The noun "decade" means "ten (10)" or "ten (10) years." Usage: The Christian Era began with the year 1 A.D., thus the Two Hundred First (201^st) Decade includes the years 2001 through 2010. In contrast, the Two Thousand Tens (2010's) include the years 2010 through 2019. See also Prefixes & Words Based On Greek Number Names.
decagon	The noun and adjective "decagon" means "a plain figure with ten (10) straight sides." See also Prefixes & Words Based On Greek Number Names.
decagram	1. The noun and adjective "decagram" means "an interconnected star figure with ten (10) points formed by stellating a decagon." See also Prefixes & Words Based On Greek Number Names.
decagram	2. The noun "decagram" means "a word or character sequence consisting of ten (10) characters."
decahedron	The noun and adjective "decahedron" means "a solid figure with ten (10) planar faces." See also Prefixes & Words Based On Greek Number Names.
decalogue	The noun "decalogue" means "ten (10) rules." Capitalized, "Decalogue" means "the Ten Commandments." More generally, "decalogue" means "a basic set of binding rules." See also Prefixes & Words Based On Greek Number Names.
decameter	The noun "decameter" means "a verse consisting of ten (10) metrical feet."
decangle	The noun "decangle" means "a plane figure with ten (10) vertices."
decathlon	The noun "decathlon" means "an athletic competition consisting of ten (10) separate events."
December	The month name "December" literally means "the tenth (10^th) month." The Roman year began on the first (1^st) day of March.
decemmillenary	1. The noun and adjective "decemmillenary" means "a group of ten thousand (10000)."
	2. The noun and adjective "decemmillenary" means "a period of ten thousand (10000) years."
	3. The noun and adjective "decemmillenary" means "a ten thousand (10000) year anniversary."
	4. The adjective and noun "decemmillenary" means "ten thousandth (10,000th) in rank or order."
decemmillennial	1. The adjective and noun "decemmillennial" means "recurring every ten thousand (10000) years."
	2. The adjective and noun "decemmillennial" means "lasting ten thousand (10000) years."
	3. The noun and adjective "decemmillennial" means "a ten thousand (10000) year anniversary."
decemmillennium	The noun and adjective "decemmillennium" means "a period of ten thousand (10000) years."
decemmillesimal	The adjective "decemmillesimal" means "based on the number ten thousand (10,000)." See also Base Number Systems.
decemvir	The noun "decemvir" means "one of ten (10) ruling men."
decemvirate	The noun "decemvirate" means "a ruling body of ten (10) men."
decennary	The noun and adjective "decennary" means "a group of ten (10) or a period of ten (10) years."
decennial	1. The adjective and noun "decennial" means "recurring every ten (10) years."
	2. The adjective and noun "decennial" means "lasting ten (10) years."
	3. The noun and adjective "decennial" means "a ten (10) year anniversary."
decennium	The noun and adjective "decennium" means "a period of ten (10) years."
decennoval	The adjective "decennoval" means "based on the number nineteen (19)."
deci-	1. The numeric prefix "deci-" means "ten (10)." This prefix is derived from the Latin cardinal number "decem (X)."
deci-	2. The traditional metric prefix "deci-" (prefix symbol: d- ) denotes a multiple of one tenth (1/10 = 0.100).
decibel	1. The noun and adjective "decibel" (symbol: dB ) is a logarithmic comparison of power levels equal to "a ratio of ten to the one-tenth power (10^0.1)" or approximately 1.258 925 411 794. Ten (10) decibels equal one (1) bel or a power ratio of ten (10), and twenty (20) decibels equal two (2) bels or a power ratio of one hundred (100).
decibel	2. The noun and adjective "decibel" (symbol: dB ) is a logarithmic measure of sound power density relative to a power density of "ten to the negative twelfth power (10^-12 = 1E-12 = 0.000 000 000 000) watts per square meter (W/m²) = 1 picowatt per square meter (pW/m²)." Ten (10) decibels are a sound level of 10 pW/m², and twenty (20) decibels are a sound level of 100 pW/m².
decile	The noun "decile" means "a frequency distribution divided into ten (10) equal parts."
decillion	The noun and adjective "decillion" means multiplied by 10³³ in the American number naming system, but means multiplied by 10⁶⁰ in the Chuquet number naming system. See also Large Numbers.
decimal	The adjective "decimal" means "based on the number ten (10)." See also base ten, Base Number Systems, and Base Number Notation.
decimal format	The compound noun and adjective "decimal format" means "the base ten (base_10) number notation system." See also Decimal Number Names.
decimal fraction	The compound noun and adjective "decimal fraction" means "a fraction expressed in decimal format." See also Decimal Fraction Names.
decimal number	The compound noun and adjective "decimal number" means "a real number expressed in decimal format." See also Decimal Number Names.
decimal point	The compound noun and adjective "decimal point" means "the punctuation mark (either a period (.) or a comma(,)) placed to the right of the units (1s) digit of a real number in standard decimal format." See also Decimal Number Names.
decimate	The verb "decimate" literally means "to kill one out of ten (1/10 = 0.100)." More generally, "decimate" means "to destroy a substantial portion." Usage: "Decimate" is often erroneously used to mean "to exterminate" or "to destroy completely." The common expression "completely decimate" is both illogical and confusing. Origin: Roman military tacticians reasoned that a military unit could continue to fight effectively if less than 10% of its members were killed. A unit that suffered more than one in ten killed usually had to reorganize before continuing a campaign. Generals of the Roman Imperial Army later used this rule of thumb to punish cowardly or disobedient legions. The members of the unit to be punished by decimation were lined up unarmed in a single file between two fully armed legions of loyal soldiers. The soldiers were counted in order from one to ten, and each unlucky tenth soldier was executed on the spot. The survivors of this ruthless punishment were returned to duty to face death another day.
decimation	The noun "decimation" literally means "the killing of one out of ten (1/10 = 0.100)." More generally, "decimation" means "the destruction of a substantial portion." See also "decimate."
dectet	The noun "dectet" means "a group of ten (10) members."
decuple	The verb, adjective, adverb, and noun "decuple" means "multiply by ten (10)."
decurion	The noun "decurion" literally means "one who commands ten (10)." A "decurion" was "a Roman officer commanding a cavalry unit of about ten (10) soldiers."
deep six	The noun and verb "deep six" means "disposal, especially by throwing overboard." A minimum water depth of six (6) fathoms (approximately 11 meters) was once considered adequate for disposal of rubbish at sea.
degree	In angular measurement, the noun and adjective "degree" (suffix symbol: -° {degree symbol} ) means "one three-hundred-sixtieth (1/360) of a circle."
-°	The suffix symbol -° {degree symbol} denotes an angular measurement in degrees. One degree is equal to one three-hundred-sixtieth (1/360) of a circle. The degree symbol is also used as part of the compound symbols that represent units of relative temperature, e.g., -°C and -°F.
deka-	The traditional metric prefix "deka-" (compound prefix symbol: da- ) denotes a multiple of ten (10). See also "deca-."
demi-	The Latin-based numeric prefix "demi-" means "one half (1/2)."
denary	1. The adjective and noun "denary" means "tenth (10^th) in order or importance."
denary	2. The adjective "denary" means "having ten (10) parts."
deuce	The noun "deuce" means "two (2)." In parlor games, "deuce" means "a playing card, die, or domino that represents the number two or a throw of dice that totals two." In tennis, "deuce" means "a tie that requires two successive points or games to win."
di-	The prefix "di-" means "two (2)." See also Prefixes & Words Based On Greek Number Names and Numeric Prefixes Used In Chemistry.
dicker	The noun "dicker" means "ten (10)." See also Prefixes & Words Based On Greek Number Names and Numeric Prefixes Used In Chemistry.
dicta-	The prefix "dicta-" means "two hundred (200)." See also Numeric Prefixes Used In Chemistry.
digit	1. The noun and adjective "digit" means "a single symbol used to represent a number." See also "numeral."
	2. The noun and adjective "digit" means "the position occupied by a digit in a positional number notation system."
	3. The adjective "digit" means "the total number of digits in a number."
diheptaconta-	The prefix "diheptaconta-" means "seventy-two (72)."
dihexaconta-	The prefix "dihexaconta-" means "sixty-two (62)."
diicosa-	The prefix "diicosa-" means "twenty-two (22)."
dilia-	The prefix "dilia-" means "two thousand (2000)." See also Numeric Prefixes Used In Chemistry.
dimeric	The adjective "dimeric" means "composed of two (2) parts or divisions."
dimerous	The adjective "dimerous" means "consisting of two (2) parts or segments."
dimeter	The noun "dimeter" means "a verse consisting of either two (2) metrical feet or two (2) dipodies."
dinonaconta-	The prefix "dinonaconta-" means "ninety-two (92)."
dioctaconta-	The prefix "dioctaconta-" means "eighty-two (82)."
dipentaconta-	The Gprefix "dipentaconta-" means "fifty-two (52)."
dipody	The noun "dipody" means "a prosodic unit consisting of two (2) feet."
ditetraconta-	The prefix "ditetraconta-" means "forty-two (42)."
ditriaconta-	The prefix "ditriaconta-" means "thirty-two (32)."
dodeca-	The prefix "dodeca-" means "twelve (12)." See also Prefixes & Words Based On Greek Number Names and Numeric Prefixes Used In Chemistry.
dodecad	The noun and adjective "dodecad" means "a group of twelve (12) members." See also Prefixes & Words Based On Greek Number Names.
dodecagon	The noun and adjective "dodecagon" means "a plain figure with twelve (12) straight sides." See also Prefixes & Words Based On Greek Number Names.
dodecagram	1. The noun and adjective "dodecagram" means "an interconnected star figure with twelve (12) points formed by stellating a dodecagon." See also Prefixes & Words Based On Greek Number Names.
dodecagram	2. The noun "dodecagram" means "a word or character sequence consisting of twelve (12) characters."
dodecahedron	The noun and adjective "dodecahedron" means "a solid figure with twelve (12) planar faces." See also Prefixes & Words Based On Greek Number Names.
dodecillion	The noun and adjective "dodecillion" is an alternate form of "duodecillion." See also Prefixes & Words Based On Greek Number Names.
dodrancentennial	1. The adjective and noun "dodrancentennial" means "recurring every seventy-five (75) years."
	2. The adjective and noun "dodrancentennial" means "lasting seventy-five (75) years."
	3. The noun and adjective "dodrancentennial" means "a seventy-five (75) year anniversary."
dodranmillenary	1. The noun and adjective "dodranmillenary" means "a group of seven hundred fifty (750)."
	2. The noun and adjective "dodranmillenary" means "a period of seven hundred fifty (750) years."
	3. The noun and adjective "dodranmillenary" means "a seven hundred fifty (750) year anniversary."
	4. The adjective and noun "dodranmillenary" means "seven hundred fiftieth (750th) in rank or order."
dodranmillennial	1. The adjective and noun "dodranmillennial" means "recurring every seven hundred fifty (750) years."
	2. The adjective and noun "dodranmillennial" means "lasting seven hundred fifty (750) years."
	3. The noun and adjective "dodranmillennial" means "a seven hundred fifty (750) year anniversary."
dodranmillennium	The noun and adjective "dodranmillennium" means "a period of seven hundred fifty (750) years."
doheptaconta-	The prefix "doheptaconta-" means "seventy-two (72)." See also Numeric Prefixes Used In Chemistry.
dohexaconta-	The prefix "dohexaconta-" means "sixty-two (62)." See also Numeric Prefixes Used In Chemistry.
doicosa-	The prefix "doicosa-" means "twenty-two (22)." See also Numeric Prefixes Used In Chemistry.
dononaconta-	The prefix "dononaconta-" means "ninety-two (92)." See also Numeric Prefixes Used In Chemistry.
dononagintillion	The noun and adjective "dononagintillion" is an alternate form of "duononagintillion."
dooctaconta-	The prefix "dooctaconta-" means "eighty-two (82)." See also Numeric Prefixes Used In Chemistry.
dooctogintillion	The noun and adjective "dooctogintillion" is an alternate form of "duooctogintillion."
dopentaconta-	The prefix "dopentaconta-" means "fifty-two (52)." See also Numeric Prefixes Used In Chemistry.
doquadragintillion	The noun and adjective "doquadragintillion" is an alternate form of "duoquadragintillion."
doquinquagintillion	The noun and adjective "doquinquagintillion" is an alternate form of "duoquinquagintillion."
doseptuagintillion	The noun and adjective "doseptuagintillion" is an alternate form of "duoseptuagintillion."
dosexagintillion	The noun and adjective "dosexagintillion" is an alternate form of "duosexagintillion."
dotetraconta-	The prefix "dotetraconta-" means "forty-two (42)." See also Numeric Prefixes Used In Chemistry.
dotriaconta-	The prefix "dotriaconta-" means "thirty-two (32)." See also Numeric Prefixes Used In Chemistry.
dotrigintillion	The noun and adjective "dotrigintillion" is an alternate form of "duotrigintillion."
double	The verb, adjective, adverb, and noun "double" means "multiply by two (2)."
double agent	The compound noun "double agent" means "a person who serves as an agent of one government while pretending to be the agent of another, often adversarial, government." See also "duplicitous."
double cross	The compound verb and noun "double cross" means "to betray an ally or friend." See also "duplicitous."
-″	1. The suffix symbol -″ {double prime} denotes a linear measurement in inches. One inch is equal to 0.025 400 meter.
-″	2. The suffix symbol -″ {double prime} denotes an angular measurement in seconds. One second is equal to one three-thousand-six-hundredth (1/3,600) of a degree (suffix symbol: -° {degree symbol} ) or one one-million-two-hundred-ninety-six-thousandth (1/1,296,000) of a circle.
double-entendre	The compound noun "double-entendre" means "a word or phrase having two (2) or more meanings, especially when a meaning is risqué."
doubleness	The noun "doubleness" means "the state of being two (2)."
dovigintillion	The noun and adjective "dovigintillion" is an alternate spelling of "duovigintillion."
dozen	The noun and adjective "dozen" means "twelve (12)."
dual	The adjective "dual" means "having two (2) aspects or components."
dual axle	The compound noun and adjective "dual axle" means "a truck axle with two (2) wheels mounted on both (2) sides for a total of four (4) wheels."
dual tandem	The compound noun and adjective "dual tandem" means "a pair (2) of dual truck axles mounted in tandem for a total of eight (8) wheels." See also "tandem dual."
duality	The noun "duality" means "the state of having two (2) aspects."
duet	The noun "duet" means "a group of two (2) members."
duodecennary	The noun and adjective "duodecennary" means "a group of twelve (12) or a period of twelve (12) years."
duodecennial	1. The adjective and noun "duodecennial" means "recurring every twelve (12) years."
	2. The adjective and noun "duodecennial" means "lasting twelve (12) years."
	3. The noun and adjective "duodecennial" means "a twelve (12) year anniversary."
duodecennium	The noun and adjective "duodecennium" means "a period of twelve (12) years."
duodecentenary	1. The noun and adjective "duodecentenary" means "a group of one thousand two hundred (1200)."
	2. The noun and adjective "duodecentenary" means "a period of one thousand two hundred (1200) years."
	3. The noun and adjective "duodecentenary" means "a one thousand two hundred (1200) year anniversary."
	4. The adjective and noun "duodecentenary" means "one thousand two hundredth (1200th) in rank or order."
duodecentennial	1. The adjective and noun "duodecentennial" means "recurring every one thousand two hundred (1200) years."
	2. The adjective and noun "duodecentennial" means "lasting one thousand two hundred (1200) years."
	3. The noun and adjective "duodecentennial" means "a one thousand two hundred (1200) year anniversary."
duodecentennium	The noun and adjective "duodecentennium" means "a period of one thousand two hundred (1200) years."
duodeci-	The numeric prefix "duodeci-" means "twelve (12)." This prefix is derived from the Latin cardinal number "duodecim (XII)."
duodecillion	The noun and adjective "duodecillion" means multiplied by 10³⁹ in the American number naming system, but means multiplied by 10⁷² in the Chuquet number naming system. See also Large Numbers.
duodecimal	The adjective "duodecimal" means "based on the number twelve (12)." See also "base twelve" and Base Number Notation.
duodecimo	The noun "duodecimo (12mo)" means "a book with leaves printed on one twelfth (1/12) of the printer sheet." See also "twelvemo."
duodecuple	The verb, adjective, adverb, and noun "duodecuple" means "multiply by twelve (12)."
duodenary	1. The adjective and noun "duodenary" means "twelfth (12^th) in order or importance."
duodenary	2. The adjective "duodenary" means "having twelve (12) parts."
duononaginta-	The numeric prefix "duononaginta-" means "ninety-two (92)." This prefix is derived from the Latin cardinal number "duo et nonaginta (LXXXXII)."
duononagintennary	The noun and adjective "duononagintennary" means "a group of ninety-two (92) or a period of ninety-two (92) years."
duononagintennial	1. The adjective and noun "duononagintennial" means "recurring every ninety-two (92) years."
	2. The adjective and noun "duononagintennial" means "lasting ninety-two (92) years."
	3. The noun and adjective "duononagintennial" means "a ninety-two (92) year anniversary."
duononagintennium	The noun and adjective "duononagintennium" means "a period of ninety-two (92) years."
duononagintillion	The noun and adjective "duononagintillion" means multiplied by 10²⁷⁹ in the American number naming system, but means multiplied by 10⁵⁵² in the Chuquet number naming system. See also Large Numbers.
duooctoginta-	The numeric prefix "duooctoginta-" means "eighty-two (82)." This prefix is derived from the Latin cardinal number "duo et octoginta (LXXXII)."
duooctogintennary	The noun and adjective "duooctogintennary" means "a group of eighty-two (82) or a period of eighty-two (82) years."
duooctogintennial	1. The adjective and noun "duooctogintennial" means "recurring every eighty-two (82) years."
	2. The adjective and noun "duooctogintennial" means "lasting eighty-two (82) years."
	3. The noun and adjective "duooctogintennial" means "an eighty-two (82) year anniversary."
duooctogintennium	The noun and adjective "duooctogintennium" means "a period of eighty-two (82) years."
duooctogintillion	The noun and adjective "duooctogintillion" means multiplied by 10²⁴⁹ in the American number naming system, but means multiplied by 10⁴⁹² in the Chuquet number naming system. See also Large Numbers.
duoquadraginta-	The numeric prefix "duoquadraginta-" means "forty-two (42)." This prefix is derived from the Latin cardinal number "duo et quadraginta (XXXXII)."
duoquadragintennary	The noun and adjective "duoquadragintennary" means "a group of forty-two (42) or a period of forty-two (42) years."
duoquadragintennial	1. The adjective and noun "duoquadragintennial" means "recurring every forty-two (42) years."
	2. The adjective and noun "duoquadragintennial" means "lasting forty-two (42) years."
	3. The noun and adjective "duoquadragintennial" means "a forty-two (42) year anniversary."
duoquadragintennium	The noun and adjective "duoquadragintennium" means "a period of forty-two (42) years."
duoquadragintillion	The noun and adjective "duoquadragintillion" means multiplied by 10¹²⁹ in the American number naming system, but means multiplied by 10²⁵² in the Chuquet number naming system. See also Large Numbers.
duoquinquaginta-	The numeric prefix "duoquinquaginta-" means "fifty-two (52)." This prefix is derived from the Latin cardinal number "duo et quinquaginta (LII)."
duoquinquagintennary	The noun and adjective "duoquinquagintennary" means "a group of fifty-two (52) or a period of fifty-two (52) years."
duoquinquagintennial	1. The adjective and noun "duoquinquagintennial" means "recurring every fifty-two (52) years."
	2. The adjective and noun "duoquinquagintennial" means "lasting fifty-two (52) years."
	3. The noun and adjective "duoquinquagintennial" means "a fifty-two (52) year anniversary."
duoquinquagintennium	The noun and adjective "duoquinquagintennium" means "a period of fifty-two (52) years."
duoquinquagintillion	The noun and adjective "duoquinquagintillion" means multiplied by 10¹⁵⁹ in the American number naming system, but means multiplied by 10³¹² in the Chuquet number naming system. See also Large Numbers.
duoseptuaginta-	The numeric prefix "duoseptuaginta-" means "seventy-two (72)." This prefix is derived from the Latin cardinal number "duo et septuaginta (LXXII)."
duoseptuagintennary	The noun and adjective "duoseptuagintennary" means "a group of seventy-two (72) or a period of seventy-two (72) years."
duoseptuagintennial	1. The adjective and noun "duoseptuagintennial" means "recurring every seventy-two (72) years."
	2. The adjective and noun "duoseptuagintennial" means "lasting seventy-two (72) years."
	3. The noun and adjective "duoseptuagintennial" means "a seventy-two (72) year anniversary."
duoseptuagintennium	The noun and adjective "duoseptuagintennium" means "a period of seventy-two (72) years."
duoseptuagintillion	The noun and adjective "duoseptuagintillion" means multiplied by 10²¹⁹ in the American number naming system, but means multiplied by 10⁴³² in the Chuquet number naming system. See also Large Numbers.
duosexaginta-	The numeric prefix "duosexaginta-" means "sixty-two (62)." This prefix is derived from the Latin cardinal number "duo et sexaginta (LXII)."
duosexagintennary	The noun and adjective "duosexagintennary" means "a group of sixty-two (62) or a period of sixty-two (62) years."
duosexagintennial	1. The adjective and noun "duosexagintennial" means "recurring every sixty-two (62) years."
	2. The adjective and noun "duosexagintennial" means "lasting sixty-two (62) years."
	3. The noun and adjective "duosexagintennial" means "a sixty-two (62) year anniversary."
duosexagintennium	The noun and adjective "duosexagintennium" means "a period of sixty-two (62) years."
duosexagintillion	The noun and adjective "duosexagintillion" means multiplied by 10¹⁸⁹ in the American number naming system, but means multiplied by 10³⁷² in the Chuquet number naming system. See also Large Numbers.
duotrigesimal	The adjective "duotrigesimal" means "based on the number thirty-two (32)." See also Base Number Notation.
duotriginta-	The numeric prefix "duotriginta-" means "thirty-two (32)." This prefix is derived from the Latin cardinal number "duo et triginta (XXXII)."
duotrigintacentenary	1. The noun and adjective "duotrigintacentenary" means "a group of three thousand two hundred (3200)."
	2. The noun and adjective "duotrigintacentenary" means "a period of three thousand two hundred (3200) years."
	3. The noun and adjective "duotrigintacentenary" means "a three thousand two hundred (3200) year anniversary."
	4. The adjective and noun "duotrigintacentenary" means "three thousand two hundredth (3200th) in rank or order."
duotrigintacentennial	1. The adjective and noun "duotrigintacentennial" means "recurring every three thousand two hundred (3200) years."
	2. The adjective and noun "duotrigintacentennial" means "lasting three thousand two hundred (3200) years."
	3. The noun and adjective "duotrigintacentennial" means "a three thousand two hundred (3200) year anniversary."
duotrigintacentennium	The noun and adjective "duotrigintacentennium" means "a period of three thousand two hundred (3200) years."
duotrigintennary	The noun and adjective "duotrigintennary" means "a group of thirty-two (32) or a period of thirty-two (32) years."
duotrigintennial	1. The adjective and noun "duotrigintennial" means "recurring every thirty-two (32) years."
	2. The adjective and noun "duotrigintennial" means "lasting thirty-two (32) years."
	3. The noun and adjective "duotrigintennial" means "a thirty-two (32) year anniversary."
duotrigintennium	The noun and adjective "duotrigintennium" means "a period of thirty-two (32) years."
duotrigintillion	The noun and adjective "duotrigintillion" means multiplied by 10⁹⁹ in the American number naming system, but means multiplied by 10¹⁹² in the Chuquet number naming system. See also Large Numbers.
duovigintennary	The noun and adjective "duovigintennary" means "a group of twenty-two (22) or a period of twenty-two (22) years."
duovigintennial	1. The adjective and noun "duovigintennial" means "recurring every twenty-two (22) years."
	2. The adjective and noun "duovigintennial" means "lasting twenty-two (22) years."
	3. The noun and adjective "duovigintennial" means "a twenty-two (22) year anniversary."
duovigintennium	The noun and adjective "duovigintennium" means "a period of twenty-two (22) years."
duoviginti-	The numeric prefix "duoviginti-" means "twenty-two (22)." This prefix is derived from the Latin cardinal number "duo et viginti (XXII)."
duoviginticentenary	1. The noun and adjective "duoviginticentenary" means "a group of two thousand two hundred (2200)."
	2. The noun and adjective "duoviginticentenary" means "a period of two thousand two hundred (2200) years."
	3. The noun and adjective "duoviginticentenary" means "a two thousand two hundred (2200) year anniversary."
	4. The adjective and noun "duoviginticentenary" means "two thousand two hundredth (2200th) in rank or order."
duoviginticentennial	1. The adjective and noun "duoviginticentennial" means "recurring every two thousand two hundred (2200) years."
	2. The adjective and noun "duoviginticentennial" means "lasting two thousand two hundred (2200) years."
	3. The noun and adjective "duoviginticentennial" means "a two thousand two hundred (2200) year anniversary."
duoviginticentennium	The noun and adjective "duoviginticentennium" means "a period of two thousand two hundred (2200) years."
duovigintillion	The noun and adjective "duovigintillion" means multiplied by 10⁶⁹ in the American number naming system, but means multiplied by 10¹³² in the Chuquet number naming system. See also Large Numbers.
duple	The adjective and noun "duple" means "multiplied by two (2)."
duplex	The noun and adjective "duplex" means "having two (2) parts."
duplicate	1. The noun and adjective "duplicate" means "either of two (2) things exactly alike."
	2. The adjective "duplicate" means "consisting of two (2) identical or corresponding parts or examples."
	3. The noun and adjective "duplicate" means "a second (2^nd or 2^d) instance or copy of something."
	4. The verb "duplicate" means "to make double (2)."
	5. The verb "duplicate" means "to create a second (2^nd or 2^d) instance or copy of an object." Usage: "Duplicate" is often used generically to mean "reproduce", "replicate", or "copy", but properly "duplicate" means the production of only a single (1) copy.
	6. The verb "duplicate" means "to create something equal to the original (1^st) instance."
	7. The verb "duplicate" means "to do something a second (2^nd or 2^d) time."
duplicitous	The adjective and adverb "duplicitous" means "having a contradictory doubleness, especially belying true intentions by deception."
duplicity	The noun "duplicity" means "the state of being two (2) at once." Most commonly, "duplicity" means "a contradictory doubleness, especially belying true intentions by deception."
duumvir	The noun "duumvir" means "one (1) of two (2) ruling men." (In Latin, "duumvir" specifically refers to an adult male.) The plural of "duumvir" is "duumviri."
duumvirate	The noun and adjective "duumvirate" means "a ruling body of two (2) men."
dyad	The noun and adjective "dyad" means "a group of two (2) members." See also Prefixes & Words Based On Greek Number Names.
dyagram	The noun and adjective "dyagram" means "a word or character pair consisting of two (2) characters."
e	The Latin lower case letter "e" represents "Napier's Constant," the base of the natural, hyperbolic, or Naperian logarithms. "Napier's Constant" is a transcendental number approximately 2.718 281 828 459. See also The Natural Logarithmic Base and e. See also Prefixes & Words Based On Greek Number Names.
E-	The metric prefix symbol E- (metric prefix: "exa-" ) denotes a multiple of ten to the eighteenth power (10¹⁸ = 1E+18 = 1,000,000,000,000,000,000) as defined by Le Système International d'Unités (SI).
each	The singular pronoun and adjective "each" means "every single individual of a group."
Ei-	The compound binary prefix symbol Ei- (binary prefix: "exbi-" ) denotes a multiple of two to the sixtieth power (2⁶⁰ = 1,152,921,504,606,846,976) as defined by the International Electrotechnical Commission (IEC). See also "exabinary."
eight	The noun, pronoun, and adjective "eight (8)" is the standard name for "the cardinal number that follows seven (7)." "Eight" equals "two to the third power (2³)." "Eight" corresponds with the ordinal number "eighth (8^th)." See also Number Names, Number Notation Systems, and Integer Factors.
eighteen	The <>noun, pronoun, and adjective </>"eighteen (18)" is the standard name for "the cardinal number that follows seventeen (17)." "Eighteen" corresponds with the ordinal number "eighteenth (18^th)." See also Number Names, Number Notation Systems, and Integer Factors.
eighteenth	1. The adjective, adverb, and noun "eighteenth (18^th)" is the standard name for "the ordinal number that follows seventeenth (17^th)." "Eighteenth" corresponds with the cardinal number "eighteen (18)." See also Number Names.
eighteenth	2. The adjective and noun "eighteenth (1/18)" means "divided by eighteen (18)."
eighteen-wheeler	The compound noun "eighteen-wheeler (18-wheeler)" means "a tractor and trailer combination freight truck with eighteen (18) wheels." Most commonly, a tractor and trailer rig consists of a tractor with two (2) wheels for steering and tandem dual drive axles and a trailer with tandem dual trailing axles mounted near the rear. See also "octodecicycle" and "semi."
eighth	The adjective, adverb, and noun "eighth (8^th)" is the standard name for "the ordinal number that follows seventh (7^th)." "Eighth" corresponds with the cardinal number "eight (8)." See also Number Names.
eighth	2. The adjective and noun "eighth (1/8)" means "divided by eight (8)."
eighties	1. The plural noun and adjective "eighties (80s)" means "an integer multiple of eighty (80)."
eighties	2. The plural noun and adjective "eighties (80's)" means "the range of numbers at least eighty (80) but less than ninety (90)." When referring to dates, "eighties" means "a span of ten years in which the tens (10s) digit of the year number is eight (8)."
eightieth	1. The adjective, adverb, and noun "eightieth (80^th)" is the standard name for "the ordinal number that follows seventy-ninth (79^th)." "Eightieth" corresponds with the cardinal number "eighty (80)." See also Number Names.
eightieth	2. The adjective and noun "eightieth (1/80)" means "divided by eighty (80)."
eighty	The noun, pronoun, and adjective "eighty (80)" is the standard name for "the cardinal number that follows seventy-nine (79)." "Eighty" corresponds with the ordinal number "eightieth (80^th)." See also Number Names, Number Notation Systems, and Integer Factors.
eighty-eight	The noun and adjective "eighty-eight (88)" is the standard name for "the cardinal number that follows eighty-seven (87)." "Eighty-eight" corresponds with the ordinal number "eighty-eighth (88^th)." See also Number Names, Number Notation Systems, and Integer Factors.
eighty-eighth	The compound adjective, adverb, and noun "eighty-eighth (88^th)" is the standard name for "the ordinal number that follows eighty-seventh (87^th)." "Eighty-eighth" corresponds with the cardinal number "eighty-eight (88)." See also Number Names.
eighty-fifth	The compound adjective, adverb, and noun "eighty-fifth (85^th)" is the standard name for "the ordinal number that follows eighty-fourth (84^th)." "Eighty-fifth" corresponds with the cardinal number "eighty-five (85)." See also Number Names.
eighty-first	The compound adjective, adverb, and noun "eighty-first (81^st)" is the standard name for "the ordinal number that follows eightieth (80^th)." "Eighty-first" corresponds with the cardinal number "eighty-one (81)." See also Number Names.
eighty-five	The noun and adjective "eighty-five (85)" is the standard name for "the cardinal number that follows eighty-four (84)." "Eighty-five" corresponds with the ordinal number "eighty-fifth (85^th)." See also Number Names, Number Notation Systems, and Integer Factors.
eighty-four	The noun and adjective "eighty-four (84)" is the standard name for "the cardinal number that follows eighty-three (83)." "Eighty-four" corresponds with the ordinal number "eighty-fourth (84^th)." See also Number Names, Number Notation Systems, and Integer Factors.
eighty-fourth	The compound adjective, adverb, and noun "eighty-fourth (84^th)" is the standard name for "the ordinal number that follows eighty-third (83^rd or 83^d)." "Eighty-fourth" corresponds with the cardinal number "eighty-four (84)." See also Number Names.
eighty-nine	The noun and adjective "eighty-nine (89)" is the standard name for "the cardinal number that follows eighty-eight (88)." "Eighty-nine" corresponds with the ordinal number "eighty-ninth (89^th)." See also Number Names, Number Notation Systems, and Integer Factors.
eighty-ninth	The compound adjective, adverb, and noun "eighty-ninth (89^th)" is the standard name for "the ordinal number that follows eighty-eighth (88^th)." "Eighty-ninth" corresponds with the cardinal number "eighty-nine (89)." See also Number Names.
eighty-one	The noun and adjective "eighty-one (81)" is the standard name for "the cardinal number that follows eighty (80)." "Eighty-one" corresponds with the ordinal number "eighty-first (81^st)." See also Number Names, Number Notation Systems, and Integer Factors.
eighty-second	The compound adjective, adverb, and noun "eighty-second (82^nd or 82^d)" is the standard name for "the ordinal number that follows eighty-first (81^st)." "Eighty-second" corresponds with the cardinal number "eighty-two (82)." See also Number Names.
eighty-seven	The noun and adjective "eighty-seven (87)" is the standard name for "the cardinal number that follows eighty-six (86)." "Eighty-seven" corresponds with the ordinal number "eighty-seventh (87^th)." See also Number Names, Number Notation Systems, and Integer Factors.
eighty-seventh	The compound adjective, adverb, and noun "eighty-seventh (87^th)" is the standard name for "the ordinal number that follows eighty-sixth (86^th)." "Eighty-seventh" corresponds with the cardinal number "eighty-seven (87)." See also Number Names.
eighty-six	The noun and adjective "eighty-six (86)" is the standard name for "the cardinal number that follows eighty-five (85)." "Eighty-six" corresponds with the ordinal number "eighty-sixth (86^th)." See also Number Names, Number Notation Systems, and Integer Factors.
eighty-sixth	The compound adjective, adverb, and noun "eighty-sixth (86^th)" is the standard name for "the ordinal number that follows eighty-fifth (85^th)." "Eighty-sixth" corresponds with the cardinal number "eighty-six (86)." See also Number Names.
eighty-third	The compound adjective, adverb, and noun "eighty-third (83^rd or 83^d)" is the standard name for "the ordinal number that follows eighty-second (82^nd or 82^d)." "Eighty-third" corresponds with the cardinal number "eighty-three (83)." See also Number Names.
eighty-three	The noun and adjective "eighty-three (83)" is the standard name for "the cardinal number that follows eighty-two (82)." "Eighty-three" corresponds with the ordinal number "eighty-third (83^rd or 83^d)." See also Number Names, Number Notation Systems, and Integer Factors.
eighty-two	The noun and adjective "eighty-two (82)" is the standard name for "the cardinal number that follows eighty-one (81)." "Eighty-two" corresponds with the ordinal number "eighty-second (82^nd or 82^d)." See also Number Names, Number Notation Systems, and Integer Factors.
eleven	The noun, pronoun, and adjective "eleven (11)" is the standard name for "the cardinal number that follows ten (10)." "Eleven" corresponds with the ordinal number "eleventh (11^th)." See also Number Names, Number Notation Systems, and Integer Factors.
eleventh	1. The adjective, adverb, and noun "eleventh (11^th)" is the standard name for "the ordinal number that follows tenth (10^th)." "Eleventh" corresponds with the cardinal number "eleven (11)." See also Number Names.
eleventh	2. The compound adjective and noun "eleventh (1/11)" means "divided by eleven (11)."
ennea-	The prefix "ennea-" means "nine (9)." See also Prefixes & Words Based On Greek Number Names.
enneaconta-	The prefix "enneaconta-" means "ninety (90)." See also Prefixes & Words Based On Greek Number Names.
enneacontad	The noun and adjective "enneacontad" means "a group of ninety (90) members." See also Prefixes & Words Based On Greek Number Names.
enneacontadi-	The prefix "enneacontadi-" means "ninety-two (92)." "Enneacontadi-" is an alternate form of the prefix "enneacontakaidi-." See also Prefixes & Words Based On Greek Number Names.
enneacontaennea-	The prefix "enneacontaennea-" means "ninety-nine (99)." "Enneacontaennea-" is an alternate form of the prefix "enneacontakaiennea-."
enneacontagon	The noun and adjective "enneacontagon" means "a plain figure with ninety (90) straight sides." See also Prefixes & Words Based On Greek Number Names.
enneacontagram	1. The noun and adjective "enneacontagram" means "an interconnected star figure with ninety (90) points formed by stellating a enneacontagon." See also Prefixes & Words Based On Greek Number Names.
enneacontahedron	The noun and adjective "enneacontahedron" means "a solid figure with ninety (90) planar faces." See also Prefixes & Words Based On Greek Number Names.
enneacontahena-	The prefix "enneacontahena-" means "ninety-one (91)." "Enneacontahena-" is an alternate form of the prefix "enneacontakaihena-." See also Prefixes & Words Based On Greek Number Names.
enneacontahepta-	The prefix "enneacontahepta-" means "ninety-seven (97)." "Enneacontahepta-" is an alternate form of the prefix "enneacontakaihepta-."
enneacontahexa-	The prefix "enneacontahexa-" means "ninety-six (96)." "Enneacontahexa-" is an alternate form of the prefix "enneacontakaihexa-."
enneacontakaidi-	The prefix "enneacontakaidi-" means "ninety-two (92)." See also Prefixes & Words Based On Greek Number Names.
enneacontakaidigon	The noun and adjective "enneacontakaidigon" means "a plain figure with ninety-two (92) straight sides." See also Prefixes & Words Based On Greek Number Names.
enneacontakaidigram	The noun and adjective "enneacontakaidigram" means "an interconnected star figure with ninety-two (92) points formed by stellating a enneacontakaidigon." See also Prefixes & Words Based On Greek Number Names.
enneacontakaidihedron	The noun and adjective "enneacontakaidihedron" means "a solid figure with ninety-two (92) planar faces." See also Prefixes & Words Based On Greek Number Names.
enneacontakaidyad	The noun and adjective "enneacontakaidyad" means "a group of ninety-two (92) members." See also Prefixes & Words Based On Greek Number Names.
enneacontakaiennea-	The prefix "enneacontakaiennea-" means "ninety-nine (99)." See also Prefixes & Words Based On Greek Number Names.
enneacontakaiennead	The noun and adjective "enneacontakaiennead" means "a group of ninety-nine (99) members." See also Prefixes & Words Based On Greek Number Names.
enneacontakaienneagon	The noun and adjective "enneacontakaienneagon" means "a plain figure with ninety-nine (99) straight sides." See also Prefixes & Words Based On Greek Number Names.
enneacontakaienneagram	The noun and adjective "enneacontakaienneagram" means "an interconnected star figure with ninety-nine (99) points formed by stellating a enneacontakaienneagon." See also Prefixes & Words Based On Greek Number Names.
enneacontakaienneahedron	The noun and adjective "enneacontakaienneahedron" means "a solid figure with ninety-nine (99) planar faces." See also Prefixes & Words Based On Greek Number Names.
enneacontakaihena-	The prefix "enneacontakaihena-" means "ninety-one (91)." See also Prefixes & Words Based On Greek Number Names.
enneacontakaihenad	The noun and adjective "enneacontakaihenad" means "a group of ninety-one (91) members." See also Prefixes & Words Based On Greek Number Names.
enneacontakaihenagon	The noun and adjective "enneacontakaihenagon" means "a plain figure with ninety-one (91) straight sides." See also Prefixes & Words Based On Greek Number Names.
enneacontakaihenagram	The noun and adjective "enneacontakaihenagram" means "an interconnected star figure with ninety-one (91) points formed by stellating a enneacontakaihenagon." See also Prefixes & Words Based On Greek Number Names.
enneacontakaihenahedron	The noun and adjective "enneacontakaihenahedron" means "a solid figure with ninety-one (91) planar faces." See also Prefixes & Words Based On Greek Number Names.
enneacontakaihepta-	The prefix "enneacontakaihepta-" means "ninety-seven (97)." See also Prefixes & Words Based On Greek Number Names.
enneacontakaiheptad	The noun and adjective "enneacontakaiheptad" means "a group of ninety-seven (97) members." See also Prefixes & Words Based On Greek Number Names.
enneacontakaiheptagon	The noun and adjective "enneacontakaiheptagon" means "a plain figure with ninety-seven (97) straight sides." See also Prefixes & Words Based On Greek Number Names.
enneacontakaiheptagram	The noun and adjective "enneacontakaiheptagram" means "an interconnected star figure with ninety-seven (97) points formed by stellating a enneacontakaiheptagon." See also Prefixes & Words Based On Greek Number Names.
enneacontakaiheptahedron	The noun and adjective "enneacontakaiheptahedron" means "a solid figure with ninety-seven (97) planar faces." See also Prefixes & Words Based On Greek Number Names.
enneacontakaihexa-	The prefix "enneacontakaihexa-" means "ninety-six (96)." See also Prefixes & Words Based On Greek Number Names.
enneacontakaihexad	The noun and adjective "enneacontakaihexad" means "a group of ninety-six (96) members." See also Prefixes & Words Based On Greek Number Names.
enneacontakaihexagon	The noun and adjective "enneacontakaihexagon" means "a plain figure with ninety-six (96) straight sides." See also Prefixes & Words Based On Greek Number Names.
enneacontakaihexagram	The noun and adjective "enneacontakaihexagram" means "an interconnected star figure with ninety-six (96) points formed by stellating a enneacontakaihexagon." See also Prefixes & Words Based On Greek Number Names.
enneacontakaihexahedron	The noun and adjective "enneacontakaihexahedron" means "a solid figure with ninety-six (96) planar faces." See also Prefixes & Words Based On Greek Number Names.
enneacontakaiocta-	The prefix "enneacontakaiocta-" means "ninety-eight (98)." See also Prefixes & Words Based On Greek Number Names.
enneacontakaioctad	The noun and adjective "enneacontakaioctad" means "a group of ninety-eight (98) members." See also Prefixes & Words Based On Greek Number Names.
enneacontakaioctagon	The noun and adjective "enneacontakaioctagon" means "a plain figure with ninety-eight (98) straight sides." See also Prefixes & Words Based On Greek Number Names.
enneacontakaioctagram	The noun and adjective "enneacontakaioctagram" means "an interconnected star figure with ninety-eight (98) points formed by stellating a enneacontakaioctagon." See also Prefixes & Words Based On Greek Number Names.
enneacontakaioctahedron	The noun and adjective "enneacontakaioctahedron" means "a solid figure with ninety-eight (98) planar faces." See also Prefixes & Words Based On Greek Number Names.
enneacontakaipenta-	The prefix "enneacontakaipenta-" means "ninety-five (95)." See also Prefixes & Words Based On Greek Number Names.
enneacontakaipentad	The noun and adjective "enneacontakaipentad" means "a group of ninety-five (95) members." See also Prefixes & Words Based On Greek Number Names.
enneacontakaipentagon	The noun and adjective "enneacontakaipentagon" means "a plain figure with ninety-five (95) straight sides." See also Prefixes & Words Based On Greek Number Names.
enneacontakaipentagram	The noun and adjective "enneacontakaipentagram" means "an interconnected star figure with ninety-five (95) points formed by stellating a enneacontakaipentagon." See also Prefixes & Words Based On Greek Number Names.
enneacontakaipentahedron	The noun and adjective "enneacontakaipentahedron" means "a solid figure with ninety-five (95) planar faces." See also Prefixes & Words Based On Greek Number Names.
enneacontakaitetra-	The prefix "enneacontakaitetra-" means "ninety-four (94)." See also Prefixes & Words Based On Greek Number Names.
enneacontakaitetrad	The noun and adjective "enneacontakaitetrad" means "a group of ninety-four (94) members." See also Prefixes & Words Based On Greek Number Names.
enneacontakaitetragon	The noun and adjective "enneacontakaitetragon" means "a plain figure with ninety-four (94) straight sides." See also Prefixes & Words Based On Greek Number Names.
enneacontakaitetragram	The noun and adjective "enneacontakaitetragram" means "an interconnected star figure with ninety-four (94) points formed by stellating a enneacontakaitetragon." See also Prefixes & Words Based On Greek Number Names.
enneacontakaitetrahedron	The noun and adjective "enneacontakaitetrahedron" means "a solid figure with ninety-four (94) planar faces." See also Prefixes & Words Based On Greek Number Names.
enneacontakaitri-	The prefix "enneacontakaitri-" means "ninety-three (93)." See also Prefixes & Words Based On Greek Number Names.
enneacontakaitriad	The noun and adjective "enneacontakaitriad" means "a group of ninety-three (93) members." See also Prefixes & Words Based On Greek Number Names.
enneacontakaitrigon	The noun and adjective "enneacontakaitrigon" means "a plain figure with ninety-three (93) straight sides." See also Prefixes & Words Based On Greek Number Names.
enneacontakaitrigram	The noun and adjective "enneacontakaitrigram" means "an interconnected star figure with ninety-three (93) points formed by stellating a enneacontakaitrigon." See also Prefixes & Words Based On Greek Number Names.
enneacontakaitrihedron	The noun and adjective "enneacontakaitrihedron" means "a solid figure with ninety-three (93) planar faces." See also Prefixes & Words Based On Greek Number Names.
enneacontaocta-	The prefix "enneacontaocta-" means "ninety-eight (98)." "Enneacontaocta-" is an alternate form of the prefix "enneacontakaiocta-." See also Prefixes & Words Based On Greek Number Names.
enneacontapenta-	The prefix "enneacontapenta-" means "ninety-five (95)." "Enneacontapenta-" is an alternate form of the prefix "enneacontakaipenta-."
enneacontatetra-	The prefix "enneacontatetra-" means "ninety-four (94)." "Enneacontatetra-" is an alternate form of the prefix "enneacontakaitetra-."
enneacontatri-	The prefix "enneacontatri-" means "ninety-three (93)." "Enneacontatri-" is an alternate form of the prefix "enneacontakaitri-."
ennead	The noun and adjective "ennead" means "a group of nine (9) members." See also Prefixes & Words Based On Greek Number Names.
enneadeca-	The prefix "enneadeca-" means "nineteen (19)." "Enneadeca-" is an alternate form of the prefix "enneakaideca-." See also Prefixes & Words Based On Greek Number Names.
enneagon	The noun and adjective "enneagon" means "a plain figure with nine (9) straight sides." See also Prefixes & Words Based On Greek Number Names.
enneagram	1. The noun and adjective "enneagram" means "an interconnected star figure with nine (9) points formed by stellating a enneagon." See also Prefixes & Words Based On Greek Number Names.
enneagram	2. The noun "enneagram" means "a word or character sequence consisting of nine (9) characters."
enneahedron	The noun and adjective "enneahedron" means "a solid figure with nine (9) planar faces." See also Prefixes & Words Based On Greek Number Names.
enneakaideca-	The prefix "enneakaideca-" means "nineteen (19)." See also Prefixes & Words Based On Greek Number Names.
enneakaidecad	The noun and adjective "enneakaidecad" means "a group of nineteen (19) members." See also Prefixes & Words Based On Greek Number Names.
enneakaidecagon	The noun and adjective "enneakaidecagon" means "a plain figure with nineteen (19) straight sides." See also Prefixes & Words Based On Greek Number Names.
enneakaidecagram	The noun and adjective "enneakaidecagram" means "an interconnected star figure with nineteen (19) points formed by stellating a enneakaidecagon." See also Prefixes & Words Based On Greek Number Names.
enneakaidecahedron	The noun and adjective "enneakaidecahedron" means "a solid figure with nineteen (19) planar faces." See also Prefixes & Words Based On Greek Number Names.
enumerate	The verb "enumerate" means "to assign a number to an object." Most commonly "enumerate" means "to count." See also "number." See also Prefixes & Words Based On Greek Number Names.
ephemeral	The adjective and noun "ephemeral" means "lasting only one (1) day." More generally, "ephemeral" means "lasting a comparatively short time."
Euler-Mascheroni Constant	The "Euler-Mascheroni Constant," also known as "Euler's Constant," (symbol: γ {Greek lower case letter gamma} ) is approximately 0.577 215 664 902. Swiss mathematician Leonhard Euler (1707-1783) discovered γ in 1734. Italian priest and mathematician Lorenzo Mascheroni made the first precise calculation of γ in 1790. See also "Euler-Mascheroni Constant, γ."
Euler's Constant	"Euler's Constant," also known as the "Euler-Mascheroni Constant," (symbol: γ {Greek lower case letter gamma} ) is approximately 0.577 215 664 902. Swiss mathematician Leonhard Euler (1707-1783) discovered γ in 1734. Italian priest and mathematician Lorenzo Mascheroni made the first precise calculation of γ in 1790. See also "Euler-Mascheroni Constant, γ."
every	The adjective "every" means "each member of a group without exception."
exa-	The metric prefix "exa-" (prefix symbol: E- ) denotes a multiple of ten to the eighteenth power (10¹⁸ = 1E+18 = 1,000,000,000,000,000,000) as defined by Le Système International d'Unités (SI).
exabinary	The adjective "exabinary" means "two to the sixtieth power (2⁶⁰ = 1,152,921,504,606,846,976)." See also binary prefix "exbi-" and compound binary prefix symbol "Ei-."
exbi-	The binary prefix "exbi-" (prefix symbol: Ei- ) denotes a multiple of two to the sixtieth power (2⁶⁰ = 1,152,921,504,606,846,976) as defined by the International Electrotechnical Commission (IEC). See also "exabinary."
exbin	The adjective and noun "exbin" means "two to the sixtieth power (2⁶⁰ = 1,152,921,504,606,846,976)." See also "exabinary" and "exbi-."
F	The Latin letter "F" is a symbol for the logical value "FALSE".
f-	The metric prefix symbol f- (metric prefix: "femto-" ) denotes a multiple of ten to the negative fifteenth power (10^-15 = 1E-15 = 0.000 000 000 000 001) as defined by Le Système International d'Unités (SI).
FALSE	The adjective, adverb, and noun "FALSE" is a logical value. "FALSE" and "TRUE" are often used as a binary logic pair.
femto-	The metric prefix "femto-" (prefix symbol: f- ) denotes a multiple of ten to the negative fifteenth power (10^-15 = 1E-15 = 0.000 000 000 000 001) as defined by Le Système International d'Unités (SI).
few	The noun and positive adjective "few" means "a relatively small number of individuals or discrete objects." Usage: The adjectives "few/fewer/fewest" are used with count nouns and collection nouns (integers), while the adjectives "little/less/least