The story
- Proto-Indo-European*h₃ep-
- Proto-Indo-European*h₃épos
- Proto-Italic*opos
- Latinopus
- Latinopera
- Latinoperātus
- English todayoperate
From Latin operātus, perfect passive participle of operor (“to work, labor, toil, have effect”), see -ate (verb-forming suffix).
Etymology from Wiktionary, CC BY-SA 4.0.