/ Dictionary / Index O ossia: Meaning and Definition of Find definitions for: os•si•a Pronunciation: (ō-sē'u), [key] — conj. (indicating an alternative, usually easier, version of a passage in a musical score) or; or else. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Ossetic Ossian Related Content Daily Word Quiz: braggart Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language