The story
- Proto-Indo-European*ḱe?
- Proto-Indo-European*ḱóm
- Proto-Italic*kom
- Proto-Italic*kom-
- Proto-Indo-European*gʷem-
- Proto-Indo-European*gʷm̥yéti
- Proto-Italic*gʷəniō
- Proto-Italic*komgʷəniō
- Latinconveniō
- Latinconventiōnem
- Middle Frenchconvention
- Englishconvention
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- English todayconventional
From convention + -al.
Etymology from Wiktionary, CC BY-SA 4.0.