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.

   6. A person who schemes and maneuvers adroitly or deviously
      to achieve his/her purposes.
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