nine times ten
Origin of ninetyMiddle English nigenty ; from Old English nigontig: see nine and amp; -ty
the cardinal number between eighty-nine and ninety-one; 90; XC (or LXXXX)
the numbers or years, as of a century, from ninety through ninety-nine
- 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 of ninetyMiddle English ninti, from Old English nigontig; see new&nlowring; in Indo-European roots.
- Ordinal: ninetieth