Operation may refer to: Scientific operation Surgery operation An operation or operator in mathematics (see unary operation, binary operation, arity) In language, an operation's a word which represents a function (or instruction), rather than a term or name In computer science, an operation's called an instruction Military operation, a military action (usually in a military campaign) using deployed forces Covert operation, a military or political action that's both clandestine and denied… (More on Operation)