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. Biographies: Notable Jewish Religious Leaders Current Events This Week: September 2023 Hispanic Population and the 2010 U.S. Census Preamble of the United Nations Charter The Jewish Calendar ✖ Related Content Daily Word Quiz: radula Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language