The story
- Proto-Indo-European*sekʷ-
- Proto-Indo-European*sokʷéh₂
- Proto-Indo-European*sokʷh₂ṓy
- Proto-Indo-European*sokʷyós
- Proto-Italic*sokjos
- Latinsokios
- Latinsocius
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Latinsociāli
- Middle Frenchsocia
- English todaysocial
From Middle French social, from Latin sociālis (“of or belonging to a companion or companionship or association, social”), from socius (“a companion, fellow, partner, associate, ally”), from sequor (“follow”). Cognate with English seg (“man, companion, fellow”). More at seg.
Etymology from Wiktionary, CC BY-SA 4.0.