Ninety Definition
nīntē
nineties
noun
nineties
The cardinal number between eighty-nine and ninety-one; 90; XC (or LXXXX)
Webster's New World
A decade or the numbers from 90 to 99.
My grandparents are in their nineties. During the heat wave, the temperature stayed in the nineties.
American Heritage
The decade from 90 to 99 in a century.
American Heritage
idiom
the Gay Nineties
- the decade 1890-99 in the U.S.
Webster's New World
the nineties
- the numbers or years, as of a century, from ninety through ninety-nine
Webster's New World
Idioms, Phrasal Verbs Related to Ninety
- the Gay Nineties
- the nineties
Origin of Ninety
-
Middle English ninti from Old English nigontig newn̥ in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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