Topic: NUMBERS
| Language: | Old English |
| Origin: | sixtig, from six 'six' |
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six‧ty

1HMN the number 60 :
sixty years ago
sixty years ago2 the years from 1960 to 1969 :
The book was written in the sixties.
the sixties
[plural] also the '60s, the 1960sTMC
The book was written in the sixties. —sixtieth adjective, pronoun:
her sixtieth birthday
her sixtieth birthday