Home › Words › F › fifteensomefifteensomefifteensome means A group of fifteen people or things.Among words judged in Lexicurio's Arena, fifteensome ranks #42,499 of 42,747 for Qualifying.EtymologyFrom fifteen + -some.nounA group of fifteen people or things.e.g.“It was one of those magical evenings during which our threesome became a fifteensome, including the pianist and Cuban expatriates from Puerto Rico, Mexico the U.S.” — 1998, George Jacunski Guiteras, “A Return to Cuba”, in Assembly, volume 57, page 23:Definitions & examples from Wiktionary (CC BY-SA 3.0).