eighteen

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Definitions from WordNet

Adjective eighteen has 1 sense

eighteen, 18, xviii - being one more than seventeen
Antonym: ordinal (indirect, via cardinal)

Noun eighteen has 1 sense

eighteen, 18, XVIII - the cardinal number that is the sum of seventeen and one
--₁ is a kind of large integer

Definitions from the Web

Eighteen

Noun: A cardinal number, equal to the sum of seventeen and one.

Sample sentence: She turned eighteen last week and can now legally vote.

Adjective: Amounting to eighteen in number.

Sample sentence: There were eighteen cupcakes on the tray.

Adverb: In or to the extent of eighteen times or units.

Sample sentence: The runner completed the race eighteen seconds faster than her previous time.

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