eighteen
Americannoun
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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
“I am eighteen years old, and I live with my sister Constance. . . . Everyone else in my family is dead.”
From The Wall Street Journal ● Nov. 14, 2025
Nearly eighteen months after her most recent post, Lilly is in a different headspace.
From BBC ● Apr. 18, 2025
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
But those eighteen inches might as well be a mile, a buffer of safety.
From "The Brightwood Code" by Monica Hesse
“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
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 Conrad, Robert Taylor
Way back yonder somewhar in the eighteens we had some mouty lot of trouble, that we did.
From The Nightrider's Feud by McConnell, Walter C.
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 Abbot, Willis J. (Willis John)
In her gun-room were mounted six long eighteens, the only guns she carried that were of sufficient weight to be matched against the heavy ordnance of the "Serapis."
From The Naval History of the United States Volume 1 by Abbot, Willis J. (Willis John)
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.
