eighteen
Americannoun
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eighteens
plural
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a cardinal number, ten plus eight.
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a symbol for this number, as 18 or XVIII.
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a set of this many persons or things.
adjective
noun
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the cardinal number that is the sum of ten and eight and the product of two and nine See also number
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a numeral, 18, XVIII, etc, representing this number
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the amount or quantity that is eight more than ten
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something represented by, representing, or consisting of 18 units
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(functioning as singular or plural) a team of 18 players in Australian Rules football
determiner
Other Word Forms
Noun Inflected Forms
Etymology
Origin of eighteen
before 1000; Middle English ehtetene, Old English eahtatēne; cognate with Old Norse āttjān, German achtzehn. See eight, -teen
Vocabulary lists containing eighteen
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
Toeing the government line, Ratcliffe reiterated that tracking emerging technologies has been his highest priority, "right up there with China," since he took office eighteen months ago.
From Barron's ● Jun. 30, 2026
On her podcast, he said he once told his brother Harry: “When I am eighteen, I will never talk to you ever again.”
From The Wall Street Journal ● Jun. 9, 2026
Over the past eighteen months or so he grew out his hair; he replaced his hoodies with boxy tees; he got really into M.M.A. and wakeboarding.
From Salon ● Jan. 16, 2025
In mice, this can be a period of up to eighteen months, while in humans it can last almost half a century, the average time between birth and menopause.
From Science Daily ● Feb. 20, 2024
He was there, and convenient, and remarkably lacking in common sense for someone who had lived all his eighteen years in New York City.
From "Night Owls" by A.R. Vishny
“Ooh wee! Yo, Benny, we got steel and eighteens on this one!” he shouted like he was talking about a car.
From "The Boy in the Black Suit" by Jason Reynolds
"Unless we attempt something of the sort, we shall have nothing heavier than the eighteens to depend on, should Monsieur de Vervillin see fit to begin."
From The Two Admirals by James Fenimore Cooper
Moultrie was four hundred and thirty-five, rank and file; his armament consisted of nine French twenty-sixes, fourteen English eighteens, nine twelve and seven nine pounders.
From Graham's Magazine, Vol. XXXII No. 4, April 1848 by Robert Taylor Conrad
Her own guns are fourteen-pounders, and with two eighteens she will be heavily armed.
From At Aboukir and Acre A Story of Napoleon's Invasion of Egypt by G. A. (George Alfred) Henty
On the English vessel, which proved to be the "Belvidera," thirty-six, the sailors were busily engaged in shifting long eighteens and carronades to the stern, making a battery of stern-chasers mounting four guns.
From The Naval History of the United States Volume 1 by Willis J. (Willis John) Abbot
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
