The story
- Proto-Indo-European*kap-
- Proto-Indo-European*kapyéti
- Proto-Italic*kapjō
- Latincapiō
- Latincapāx
- Latincapācitās
- Old Frenchcapacite
- Middle Englishcapacite
- English todaycapacity
From Middle English capacite, from Old French capacite, from Latin capācitās (whence -acity), from capāx (“able to hold much”), from capiō (“to hold, to contain, to take, to understand”).
Etymology from Wiktionary, CC BY-SA 4.0.