ninety

1. The cardinal number equal to 9 × 10.
2. nineties
   a. 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:

Origin: Middle English ninti

Origin: , from Old English nigontig; see newṇ in Indo-European roots

Related Forms:

• nineˈty adjective & pron.