operator

noun
UK /ˈɒpəreɪtə/
US /ˈɑːpəreɪtər/

A person who makes a machine or system work.

The operator answered the phone and helped the caller.


OTHER MEANINGS

2. A person who runs a business or company.

She is the operator of a small bakery.

3. A symbol or sign in math that shows an action, like plus or minus.

In the equation 3 + 4, the plus sign is an operator.

4. A person who works on a telephone switchboard.

The telephone operator connected the call.