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Definition of ninety

ninety

/ˈnaɪn.ti/
nine · ty
Plural:nineties
•
Adjective:ninetieth
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ninety Lexical Profile

ninety Game Scores & Validity

• adjective

1

Amounting to nine times ten in number; ten less than one hundred.

Example

"The historic theater has seats for ninety guests in the main balcony."

• noun

1

The cardinal number equivalent to the product of nine and ten; one more than eighty-nine, or ten less than one hundred (90).

Example

"Ninety divided by ten equals nine."

2

In the plural (nineties), the numbers, years, or degrees of temperature from ninety to ninety-nine, such as a decade of a century or a decade of a person's life.

Example

"Her grandmother remained remarkably active well into her nineties."

• Nearby Words

nineteenth
nineties
ninetieth
ninety
ninetyfold
ningbo
ninja

Word Origin & Etymology

From Middle English ninti, from Old English hundnigontig, a compound of nigon ('nine') and -tig ('group of ten'), with the archaic prefix hund- eventually dropping away.

Cite this Entry

Wordmom. (2026). Definition of Ninety. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/ninety
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