/ Dictionary / Index O O'Neill: Meaning and Definition of Find definitions for: O'Neill Pronunciation: (ō-nēl'), [key] — n. 1888–1953, U.S. playwright: Nobel prize 1936. (“Tip”), born 1912, U.S. politician: congressman 1953–87; speaker of the House 1977–87. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: o'neill (Thesaurus) Oneida Lake oneiric Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language