/ Thesaurus / S Synonyms of sub interval Find synonyms for: Noun1. sub-interval, intervalusage: an interval that is included in another intervalWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: leonine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language