- 1number 90
- 2 noun 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
in your ninetiesjump to other results
ninety-nine times out of a hundredjump to other results
ninetiethjump to other results
NAmE//ˈnaɪnt̮iəθ//ordinal number, noun There are examples of how to use ordinal numbers at the entry for fifth.