Meaning of “nineties” in the English Dictionary

british dictionary

"nineties" in British English

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ninetiesnoun [ plural ]

uk /ˈnaɪn.tiz/ us /ˈnaɪn.t̬iz/

B2 A person's nineties are the period in which they are aged between 90 and 99:

She was well into her nineties when she died.
the nineties

the range of temperature between 90° and 99°:

Today it's supposed to get very hot - maybe up into the nineties.

B2 the decade (= period of ten years) between 90 and 99 in any century, usually 1990–1999:

Bill Clinton was the US president in/during the nineties.

(Definition of “nineties” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"nineties" in American English

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ninetiesplural noun

also 90s, 90’s us /ˈnɑɪn·tiz/

the numbers 90 through 99:

It’s expected to be in the nineties (= between 90° and 99°) tomorrow.
Inflation was held in check in the nineties (= between 1990 and 1999).
I know only two people in their nineties (= between 90 and 99 years old).

(Definition of “nineties” from the Cambridge Academic Content Dictionary © Cambridge University Press)