Added 10 October 2026 fivesome /ˈfaɪvsəm/ noun Categories: Describing WordsSocietyObscure Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about fivesome at Wordnik → Where our words come from → The cardinal number that is the sum of four and one. Five people considered as a unit. Related Words: fivepentadvquintettequintetquintupletquint5cinquefinphoebe Back to today's word