- 1number 40
- 2noun the forties [plural] numbers, years, or temperatures from 40 to 49 Idioms
between the ages of 40 and 49
in your fortiesjump to other results
fortiethjump to other results
NAmE//ˈfɔrt̮iəθ//ordinal number, noun There are examples of how to use ordinal numbers at the entry for fifth.