operator in WordNet English dictionary

1. a shrewd or unscrupulous person who knows how to circumvent difficulties
   hustler  wheeler dealer  operator 
   
2. an agent that operates some apparatus or machine
   "the operator of the switchboard"
   operator  manipulator 
   
3. someone who owns or operates a business
   "who is the operator of this franchise?"
   operator 
   
4. a speculator who trades aggressively on stock or commodity markets
   operator 
   
5. (mathematics) a symbol or function representing a mathematical operation
   operator