Noun
1. (mathematics) a symbol that represents a function from functions to functions;
"the integral operator"2. an agent that operates some apparatus or machine;
"the operator of the switchboard"3. someone who owns or operates a business;
"who is the operator of this franchise?"4. a shrewd or unscrupulous person who knows how to circumvent difficulties
5. a speculator who trades aggressively on stock or commodity markets