/ Dictionary / Index O O'Casey: Meaning and Definition of Find definitions for: O'Ca•sey Pronunciation: (ō-kā'sē), [key] 1880–1964, Irish playwright. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: o'casey (Thesaurus) ocarina occ. Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language