Breadcrumb Home > Thesaurus > F Synonyms of forty Find synonyms for: Noun 1. forty, 40, XL, large integer usage: the cardinal number that is the product of ten and four Adjective 1. forty, 40, xl, twoscore, cardinal (vs. ordinal) usage: being ten more than thirty WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of forty (Dictionary) ✖ Related Content Daily Word Quiz: umbrage Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language