/ Thesaurus / O Synonyms of o'clock Find synonyms for: Adverb1. o'clockusage: according to the clock; "it's three o'clock in Tokyo now"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language