eighteen
Americannoun
-
eighteens
plural
-
a cardinal number, ten plus eight.
-
a symbol for this number, as 18 or XVIII.
-
a set of this many persons or things.
adjective
noun
-
the cardinal number that is the sum of ten and eight and the product of two and nine See also number
-
a numeral, 18, XVIII, etc, representing this number
-
the amount or quantity that is eight more than ten
-
something represented by, representing, or consisting of 18 units
-
(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:
At age eighteen, he joined the Wiltshire militia in 1807.
From Science Daily ● Sep. 7, 2026
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
A VOA spokesperson told the BBC it had engaged with Eurotunnel and their advisers "on multiple occasions over the past eighteen months to discuss their valuation and fully explain our approach".
From BBC ● Nov. 20, 2025
The shape, “surrounded by a semi-circle of light about eighteen inches in diameter,” formed itself into what looked like a human head.
From "American Spirits" by Barb Rosenstock
“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
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
Accordingly General Taylor ordered the supply train to be parked at its position and left under the guard of two twelve-pounders and the fatal eighteens which had done such signal service on the 8th.
From History of the War Between Mexico and the United States, with a Preliminary View of its Origin, Volume 1 by Brantz Mayer
One of the eighteens carried away the jib-stay and the jib-halliards.
From Woven with the Ship A Novel of 1865 by Cyrus Townsend Brady
"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
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.
