Breadcrumb Home > Dictionary > Index O OIC: Meaning and Definition of Find definitions for: OIC Pronunciation: [key] officer in charge. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. OI OIcel 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