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From The Collaborative International Dictionary of English v.0.48:
Operator \Op"er*a`tor\, n. [L.] 1. One who, or that which, operates or produces an effect. [1913 Webster] 2. (Surg.) One who performs some act upon the human body by means of the hand, or with instruments. [1913 Webster] 3. A dealer in stocks or any commodity for speculative purposes; a speculator. [Brokers' Cant] [1913 Webster] 4. (Math.) The symbol that expresses the operation to be performed; -- called also facient. [1913 Webster] 5. A person who operates a telephone switchboard. [PJC] 6. A person who schemes and maneuvers adroitly or deviously to achieve his/her purposes. [PJC]