(mathematics) a symbol or function representing a mathematical operation
"In algebra class, we learned that parentheses act as an operator by grouping terms together before applying exponents."
an agent that operates some apparatus or machine
"the operator of the switchboard"
a shrewd or unscrupulous person who knows how to circumvent difficulties
"The seasoned operator managed to close the deal before regulators could intervene, leaving everyone else wondering how he slipped through the cracks."
a speculator who trades aggressively on stock or commodity markets
"The market operator made such aggressive moves that he nearly wiped out several retail investors' accounts in minutes."
One who operates.
"The flight operator checked every instrument before taking off for Chicago."
In plain English: An operator is someone who runs or controls a machine or system.
"The phone operator connected my call to the wrong number."
Usage: An operator refers to a person or machine that performs a specific function, such as a telephone operator assisting callers or an air traffic controller managing flights. Use this term when describing someone actively in charge of running equipment or systems rather than simply owning them.
The word operator comes from the Latin operātor, which is derived from the verb meaning "to work or labor." It entered English as a noun suffix attached to the root of operate to denote someone who performs an operation.