Meaning of “eighties” in the English Dictionary

british dictionary

"eighties" in British English

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eightiesnoun [ plural ]

uk /ˈeɪ.tiz/ us /ˈeɪ.t̬iz/

B2 A person's eighties are the period in which they are aged between 80 and 89:

My grandmother is in her eighties.
the eighties

the range of temperature between 80° and 89°:

The temperature is expected to be in the eighties tomorrow.

B2 the decade (= period of ten years) between 80 and 89 in any century, usually 1980–1989:

Margaret Thatcher was the UK prime minister in/during the eighties.

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

"eighties" in American English

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eightiesplural noun

also 80s, 80’s us /ˈeɪt̬·iz/

the numbers 80 through 89:

The temperature is expected to be in the eighties (= between 80° and 89°) tomorrow.
Ronald Reagan was president in the eighties (= between 1980 and 1989).
My grandmother is in her eighties (= between 80 and 89 years old).

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