Webster's English Dictionary

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operator

op.er.a.tor \'a:p-(*-).ra-t-*r\ n 1: one that operates : as  1a: one that 
   operates a machine or device  1b: one that operates a business  1c: one 
   that performs surgical operations  1d: one that deals in stocks or 
   commodities  2a: MOUNTEBANK, FRAUD  2b: a shrewd and skillful person who 
   knows how to circumvent restrictions o r difficulties 3: a mathematical or 
   logical symbol denoting an operation to be performed