Oper

Part of speech: noun

Definitions

1. A short form for a person who runs, controls, or handles a machine, device, or piece of equipment
2. Shorthand for someone who works a machine, switchboard, or system and keeps it running
3. Clipped term for a worker who manages the functioning of equipment or a technical system

Etymology: "Oper" is a clipped form of "operator," so the shortening is the whole story here. The full word goes back to Latin "operari," meaning "to work," from "opus," "work," and it has long applied to anyone who runs a machine or manages a system. Dropping the final syllables gives a short, informal word that works well in workplace speech and on signs, where brevity counts.