Толковый словарь английского языка - operator

noun Date: 1611 one that operates: as, one that operates a machine or device, one that operates a business, one that performs surgical operations, one that deals in stocks or commodities, 2. mountebank, fraud, a shrewd and skillful person who knows how to circumvent restrictions or difficulties, 3. something and especially a symbol that denotes or performs a mathematical or logical operation, a mathematical function, a binding site in a DNA chain at which a genetic repressor binds to inhibit the initiation of transcription of messenger RNA by one or more nearby structural genes, ~less adjective