The story
- Proto-Indo-European*dwóh₁
- Proto-Indo-European*trísinflu.
- Proto-Indo-European*d(w)is-
- Proto-Italic*dis-
- Latindis-
- Latinputus
- Latinputō
- Latindisputo
- Old Frenchdesputer
- Middle Englishdisputen
- English todaydispute
From Middle English disputen, from Old French desputer (French disputer), from Latin disputāre (“to dispute, discuss, examine, compute, estimate”), from dis- (“apart”) + putāre (“to reckon, consider, think, originally make clean, clear up”), related to purus (“pure”). Compare compute, count, impute, repute, amputate, etc.
Etymology from Wiktionary, CC BY-SA 4.0.