/ ˈsɪksti; NAmE / number
1.
60
2.
noun the sixties [ pl. ] numbers, years or temperatures from 60 to 69
► six·ti·eth / ˈsɪkstiəθ; NAmE / ordinal number , noun
HELP NOTE : There are examples of how to use ordinal numbers at the entry for fifth .
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IDIOMS
- in your sixties
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WORD ORIGIN
Old English siextig (from six and -ty ).