Operator (?), 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.
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3. A dealer in stocks or any commodity for speculative purposes; a speculator. [Brokers' Cant]
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4. (Math.) The symbol that expresses the operation to be performed; -- called also facient.
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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]