Where does “fifteensome” come from?

fifteensome (English) comes from English some, from Middle English som, from Old English sum, from Proto-West Germanic *sum, from Proto-Germanic sumaz, from Proto-Indo-European sem- — together, one.

fifteensome (English): A group of fifteen people or things

Definitions

  1. A group of fifteen people or things

Ancestry of “fifteensome”, step by step

fifteensome traces back through two separate lines of ancestry.

via English some

StepLanguageWordMeaning
1EnglishsomeA certain number, at least two; An indefinite...
2Middle Englishsomsome
3Old Englishsumsome
4Proto-West Germanic*sumsome
5Proto-Germanicsumazsome (one), a certain (one)
6Proto-Indo-Europeansem-together, one

via English fifteen

StepLanguageWordMeaning
1EnglishfifteenThe cardinal number occurring after fourteen and...
2Middle Englishfiftenefifteen
3Old Englishfīftīenefifteen
4Proto-Germanicfimftehunfifteen
5Proto-Germanictehunten
6Proto-Indo-Europeandéḱm̥tten
Every word from Proto-Indo-European sem- →Every word from Proto-Germanic sumaz →Every word from Proto-West Germanic *sum →