NINETIES

[plural] [noun]The nineties is the range of temperature between 90° and 99°.The nineties is also the period of years between 90 and 99 in any century.Queen Victoria's diamond jubilee was in the nineties (= between 1890 and 1899).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.