From Proto-Italic *opis, from Proto-Indo-European *h₃ep-(i)-, *h₃op-(i)- (“force, ability”), from *h₃ep- (“to work, toil; ability”), whence also Hittite [script needed] (happina-, “rich”), Sanskrit अप्नस् (ápnas, “property, possession”), Avestan 𐬀𐬟𐬥𐬀𐬤𐬵𐬀𐬧𐬝 (afnaŋᵛhaṇt̰, “rich in property”), and possibly Ancient Greek ὄμπνη (ómpnē, “food, corn”). Related to omnis, optimus and opus.