The story
- Proto-Indo-European*bʰewg-
- Proto-Indo-European*bʰunégti
- Proto-Italic*fungōr
- Latinfungor
- Latinfūnctiō
- Old Frenchfonction
- Middle Frenchfunction
- Englishfunction
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Englishfunctional
- Proto-Indo-European*leyg-
- Proto-Germanic*līką
- English todayfunctionally
From functional + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.