EIGHTIES

[plural] [noun]The eighties is the range of temperature between 80° and 89°.The temperature is expected to be in the eighties tomorrow.The eighties is also the period of years between 80 and 89 in any century.Margaret Thatcher was the British Prime Minister for most of the eighties (= between 1980 and 1989).A person's eighties are the period in which they are aged between 80 and 89.My grandmother is in her eighties.