Breadcrumb Home > Dictionary > Index O onlooker: Meaning and Definition of Find definitions for: on•look•er Pronunciation: (on'look"ur, ôn'-), [key] — n. spectator; observer; witness. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: onlooker (Thesaurus) on-line catalog onlooking TrendingHere are the facts and trivia that people are buzzing about. The Book of Philippians: Summary Current Events This Week: May 2023 Preamble of the United Nations Charter Queen Victoria Books of the Bible: New Testament Books in Order The 88 Recognized Constellations ✖ Related Content Daily Word Quiz: miasma Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language