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Operation or Operations may refer to:

Science and technology

* Surgical operation or surgery, in medicine * Operation (mathematics), a calculation from zero or more input values (called operands) to an output value ** Arity, number of arguments or operands that the function takes ** Binary operation, calculation that combines two elements of the set to produce another element of the set ** Graph operations, produce new graphs from initial ones ** Modulo operation, operation finds the remainder after division of one number by another ** Operations research, in British usage, application of advanced analytical methods to make better decisions ** Unary operation, an operation with only one operand * Information technology operations * Rail transport operations, the control of a rail system * Scientific operation *Unit operation, a basic step in a chemical engineering process * Inference, a step in reasoning

Arts, entertainment and media

* ''Operation'' (game), a battery-operated board game that challenges dexterity * Operation (music), a term used in musical set theory * ''Operations'' (magazine), Multi-Man Publishing's house organ for articles and discussion about its wargaming products * ''The Operation'' (film), a 1973 British television film * ''The Operation'' (1990), a crime, drama, TV movie starring Joe Penny, Lisa Hartman, and Jason Beghe * ''The Operation'' (1992–1998), a reality television series from TLC * The Operation M.D., formerly The Operation, a Canadian garage rock band

Business

* Business operations, the harvesting of value from assets owned by a business * Manufacturing operations, operation of a facility * Operations management, an area of management concerned with designing and controlling the process of production

Military and law enforcement

* Military operation, a military action (usually in a military campaign) using deployed forces ** Black operation, or "Black op", an operation that may be outside of standard military protocol or against the law ** Clandestine operation, an intelligence or military operation carried out so that the operation goes unnoticed ** Combined operations, operations by forces of two or more allied nations ** Covert operation, an operation which conceals the identity of the sponsor ** Special operations, military operations that are unconventional * Operations (J3), third level of Nation Level Command Structure * Operations (military staff), staff involved in planning operations * Sting operation, an operation designed to catch a person committing a crime, by means of deception

Other uses

* Operation, a word which represents a grammatical relation (i.e., function) or instruction, rather than a term or name * Anomalous operation, in parapsychology, a term describing a broad category of purported paranormal effects * Operation of law, a legal term that indicates that a right or liability has been created for a party

See also

* Operations support system, used in the telecommunications industry * Operations room, the tactical center providing processed information for command and control of an area of operations * List of military operations * OP (disambiguation) * Operative (disambiguation) * Operator (disambiguation) {{disambiguation