(algebra, computing) A symbol representing binary operation; an operator taking two operands.

(mathematics, logic) An operation on logical values that changes true to false, and false to true.

(dated) A person who operates a radio transmitter on a ship or in an outpost, military unit, etc., in order to communicate over long distances.

plural of telephone operator

A person who accomplishes tasks with efficiency and grace, especially one with verbal skills who is persuasive in interpersonal relationships, negotiation, etc.

plural of wireless operator

(obsolete) effective; practical; operative [16th–17th c.] / Of or relating to operations.

(obsolete) A laboratory. [16th–17th c.] / (medicine) A room in which a dentist (or assistant) performs tasks on the patient. [from 20th c.]

plural of operatory

(programming) An operator taking three operands, specifically the operator ?: used in many programming languages to select one of two values depending on a third value.