Meaning of OPERATOR in English

■ noun

1》 a person who operates equipment or a machine.

↘a person who works at the switchboard of a telephone exchange.

2》 a person or company that runs a business or enterprise: a tour ~.

3》 informal a person who acts in a specified, especially manipulative, way: a smooth ~.

4》 Mathematics a symbol or function denoting an operation (e.g. ×, +).

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.