From Italian conto (“account, bill”), from Vulgar Latin *contu(s), *comptu(s), from Latin computus (“calculation”), from computō (“I calculate,”), from both con-, from cum (“with, at”), from Old Latin com, from Proto-Italic *kom (“with, along”), from Proto-Indo-European *ḱóm (“at, with”), possibly from *ḱe, and from putō (“I clean”), from putus (“pure”), from Proto-Indo-European *puHtós, from *pewH- (“to be clean”).