The story
- Proto-Indo-European*dwóh₁
- Proto-Indo-European*trísinflu.
- Proto-Indo-European*d(w)is-
- Proto-Italic*dis-
- Latindis-
- Old Frenchdes-
- Latindis-
- Middle Englishdis-
- Englishdis-
- Englishproportional
- English todaydisproportional
From dis- + proportional.
Etymology from Wiktionary, CC BY-SA 4.0.