/ Dictionary / Index O ostinato: Meaning and Definition of Find definitions for: os•ti•na•to Pronunciation: (os"ti-nä'tōIt.ôs"tē-nä'tô), [key] — pl. -tos. a constantly recurring melodic fragment. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ostinato (Thesaurus) ostiary ostiole Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language