/ Thesaurus / C Synonyms of cubic kilometer Find synonyms for: Noun1. cubic kilometer, cubic kilometre, metric capacity unitusage: a unit of capacity equal to the volume of a cube one kilometer on each edgeWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language