/ Thesaurus / B Synonyms of boundary line Find synonyms for: Noun1. boundary line, border, borderline, delimitation, mete, boundary, bound, boundsusage: a line that indicates a boundaryWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language