eighteen

[ey-teen]

noun

1. a cardinal number, ten plus eight.

2. a symbol for this number, as 18 or XVIII.

3. a set of this many persons or things.

adjective

1. amounting to 18 in number.

eighteen

/ ˈeɪˈtiːn /

noun

1. the cardinal number that is the sum of ten and eight and the product of two and nine See also number

2. a numeral, 18, XVIII, etc, representing this number

3. the amount or quantity that is eight more than ten

4. something represented by, representing, or consisting of 18 units

5. (functioning as singular or plural) a team of 18 players in Australian Rules football

determiner

1. 1. amounting to eighteen

      eighteen weeks

   2. ( as pronoun )

      eighteen of them knew

Word History and Origins

Origin of eighteen¹

before 1000; Middle English ehtetene, Old English eahtatēne; cognate with Old Norse āttjān, German achtzehn. See eight, -teen

Word History and Origins

Origin of eighteen¹

Old English eahtatēne; related to Old Norse attjan, Old High German ahtozehan

Example Sentences

“I am eighteen years old, and I live with my sister Constance. . . . Everyone else in my family is dead.”

Read more on The Wall Street Journal

In eighteen hours, it would hit the Sulzberger Ice Shelf in Antarctica, where it would knock loose an iceberg twice the size of Manhattan.

Read more on Literature

In the fog of the first eighteen months of running his own business, Eisman had an epiphany, an identifiable moment when he realized he’d been missing something obvious.

Read more on Literature

In 1921, when he was eighteen, the family emigrated to Russia.

Read more on Literature

We counted eighteen French gendarmes watching them from the shore, declining to intervene.

Read more on BBC