Where does “unsain” come from?

unsain (Welsh) comes from Welsh un, from Middle Welsh un, from Proto-Brythonic ʉn, from Proto-Celtic oinos, from Proto-Indo-European óynos — one; single.

unsain (Welsh): unison

Definitions

  1. unison

Ancestry of “unsain”, step by step

unsain traces back through two separate lines of ancestry.

via Welsh un

StepLanguageWordMeaning
1Welshunonly; one; one, individual
2Middle Welshunone
3Proto-Brythonicʉnone
4Proto-Celticoinosone
5Proto-Indo-Europeanóynosone; single

via Welsh sain

StepLanguageWordMeaning
1Welshsainsound
Every word from Proto-Indo-European óynosEvery word from Proto-Celtic oinosEvery word from Proto-Brythonic ʉn