Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: nigontig, from nigon 'nine'

ninety

 number
     
Related topics: Numbers
nine‧ty
1HMN the number 90
2TMC

the nineties

[plural] also the '90s, the 1990s the years from 1990 to 1999:
America was far richer in the nineties.
the early/mid/late nineties
The industry received a lot of bad publicity in the early nineties.
3

be in your nineties

to be aged between 90 and 99
early/mid/late nineties
My grandfather was in his early nineties when he died.
4

in the nineties

if the temperature is in the nineties, it is between 90 degrees and 99 degrees
in the low/mid/high nineties
Temperatures were still in the high nineties.
—ninetieth adjective:
her ninetieth birthday
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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