1.Definition: (mathematics) a symbol or function representing a mathematical operation

Category: General

2.Definition: a shrewd or unscrupulous person who knows how to circumvent difficulties

Related Noun(s):hustler, wheeler dealer

Category: People

3.Definition: a speculator who trades aggressively on stock or commodity markets

Category: People

4.Definition: an agent that operates some apparatus or machine

"The operator of the switchboard"

Related Noun(s):manipulator

Category: People

5.Definition: someone who owns or operates a business

"Who is the operator of this franchise?"

Category: People