- 1number 50
- 2noun the fifties [plural] numbers, years, or temperatures from 50 to 59 She was born in the fifties. Idioms
between the ages of 50 and 59 He retired when he was in his fifties.
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NAmE//ˈfɪftiəθ//ordinal number, noun There are examples of how to use ordinal numbers at the entry for fifth.