/ Thesaurus / I Synonyms of indefinite integral Find synonyms for: Noun1. indefinite integral, integralusage: the set of functions F(x) + C, where C is any real number, such that F(x) is the integral of f(x)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: devout Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language