English edit

English numbers (edit)
 ←  14 15 16  → 
    Cardinal: fifteen
    Ordinal: fifteenth
    Adverbial: fifteen times
    Multiplier: fifteenfold
    Group collective: fifteensome

Etymology edit

fifteen +‎ -some

Noun edit

fifteensome (plural fifteensomes)

  1. (rare) A group of fifteen people or things.
    • 1998, George Jacunski Guiteras, “A Return to Cuba”, in Assembly, volume 57, page 23:
      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.
    • 2015, Dan Jenkins, The Dogged Victims of Inexorable Fate, Simon & Schuster, →ISBN:
      There would be an excellent chance that all of us would be in one hollering, protesting, club-slinking fifteensome, betting $800 million.
    • 2020 March 12, “‘Our first date ended in a foursome’: Group sex stories that actually happened”, in The Tab:
      In this week’s episode of “Is it in Yet?”, The Tab’s sex podcast we’ve heard from lots of naughty listeners who’ve somehow ended up having spontaneous threesomes, foursomes, and even – yes – a fifteensome.