THIRTY

noun (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 see: number the numbers 30 to 39, a sign of completion ; end , the second point scored by a side in a game of tennis, thirtieth adjective or noun ~ adjective ~ pronoun, plural in construction ~ish adjective