Breadcrumb Home > Thesaurus > O Synonyms of owlt Find synonyms for: Noun1. one-way light time, OWLT, elapsed timeusage: the elapsed time it takes for light (or radio signals) to travel between the Earth and a celestial objectWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. ✖ Related Content Daily Word Quiz: deracinate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language