The story
- Proto-Indo-European*ís?
- Proto-Indo-European*h₁óynos
- Proto-Italic*oinos
- Old Latinoinos
- Latinūnus
- Latinūniō
- Latinūnītu
- Middle Englishuniten
- English todayunite
From Middle English uniten, from Latin ūnītus, perfect passive participle of ūniō.
Etymology from Wiktionary, CC BY-SA 4.0.