/ Thesaurus / S Synonyms of space time Find synonyms for: Noun1. space-time, space-time continuum, coordinate system, frame of reference, reference system, reference frameusage: the four-dimensional coordinate system (3 dimensions of space and 1 of time) in which physical events are locatedWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language