Topic: NUMBERS
| Language: | Old English |
| Origin: | nigontig, from nigon 'nine' |
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nine‧ty

1HMN the number 90
2TMC the years from 1990 to 1999 :
America was far richer in the nineties.
the nineties
[plural] also the '90s, the 1990s
America was far richer in the nineties. —ninetieth adjective:
her ninetieth birthday
her ninetieth birthday