Main Entry: thir·ty

Pronunciation: \ˈthər-tē\

Function: noun

Inflected Form(s): plural thirties

Etymology: Middle English thritty, from thritty, adjective, from Old English thrītig, from thrītig group of 30, from thrīe three + -tig group of ten; akin to Old English tīen ten

Date: before 12th century

1 — see number table
2 plural : the numbers 30 to 39; specifically : the years 30 to 39 in a lifetime or century
3 : a sign of completion : end —usually written 30 <wrote thirty on the last page of the story>
4 : the second point scored by a side in a game of tennis

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

— thirty adjective

— thirty pronoun, plural in construction

— thir·ty·ish \-ish\ adjective