- 1number 90
- 2noun the nineties [plural] numbers, years, or temperatures from 90 to 99 The temperature must be in the nineties today. Idioms
between the ages of 90 and 99
almost always
NAmE//ˈnaɪnt̮iəθ//
ordinal number, noun There are examples of how to use ordinal numbers at the entry for fifth.See ninety in the Oxford Advanced Learner's DictionaryCheck pronunciation: ninety