ninety definition by Webster's New World
Origin: Middle English nigenty ; from Old English nigontig: see nine and amp; -ty
ninety definition by American Heritage Dictionary
noun pl. nine·ties
- The cardinal number equal to 9 × 10.
- ninetiesa. 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.b. often Nineties The decade from 90 to 99 in a century.
Origin: Middle English ninti, from Old English nigontig; see newṇ in Indo-European roots.
- nineˈty adjective & pron.
ninety - Phrases/Idioms