Main Entry: nine·ty

Pronunciation: \ˈnīn-tē\

Function: noun

Inflected Form(s): plural nineties

Etymology: Middle English ninety, adjective, from Old English nigontig, short for hundnigontig, from hundnigontig, noun, group of 90, from hund-, literally, hundred + nigon nine + -tig group of 10; akin to Old English tīen ten

Date: before 12th century

1 — see number table
2 plural : the numbers 90 to 99; specifically : the years 90 to 99 in a lifetime or century

— nine·ti·eth \-tē-əth\ adjective or noun

— ninety adjective

— ninety pronoun, plural in construction