Breadcrumb Home > Thesaurus > O Synonyms of or Find synonyms for: Noun 1. Oregon, Beaver State, OR usage: a state in northwestern United States on the Pacific 2. operating room, OR, operating theater, operating theatre, surgery, hospital room usage: a room in a hospital equipped for the performance of surgical operations; "great care is taken to keep the operating rooms aseptic" WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of or (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: variegate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language