operator Definition

1. Someone who operates a machine or apparatus.

Thesaurus: engineer, labourer, worker, employee, technician.
2. Someone who operates a telephone switchboard, connecting calls, etc.
3. Someone who runs a business.
4. math.
Any symbol used to indicate that a particular mathematical operation is to be carried out, eg ′ which shows that two numbers are to be multiplied.
5. colloq
A calculating, shrewd and manipulative person.
Thesaurus: schemer, conniver, wheeler-dealer (slang), manipulator, fraud.