Added 10 October 2026 two-fifths noun noun ! Definition from Wiktionary (CC BY-SA). More about two-fifths at Wordnik → Where our words come from → Two of five equal parts (2/5, ⅖, 0.4). Related Words: four-fifthsone-fifthfive-sixthsone-halftwo-thirdsfive-eighthsfifthfive-hundredththree-fourthsthree-quartershalf Back to today's word