Operation may refer to:

• Scientific Operation. Scientific method refers to bodies of Techniques for investigating phenomena
• Surgery operation. Surgery (from the χειρουργική cheirourgikē, via chirurgiae meaning "hand work" is a medical specialty that uses operative manual and instrumental
• An operation or operator in mathematics. In its simplest meaning in Mathematics and Logic, an operation is an action or procedure which produces a new value from one or more input values In Mathematics, an operator is a function which operates on (or modifies another function See unary operation, binary operation, arity. In Mathematics, a unary operation is an operation with only one Operand, i In Mathematics, a binary operation is a calculation involving two Operands, in other words an operation whose Arity is two In Logic, Mathematics, and Computer science, the arity (synonyms include type, adicity, and rank) of a function
• In language, an operation is a word which represents a function (or instruction) rather than a term, or a name. A language is a dynamic set of visual auditory or tactile Symbols of Communication and the elements used to manipulate them A word is a unit of Language that carries meaning and consists of one or more Morphemes which are linked more or less tightly together and has a Phonetic In Linguistics, grammatical functions or ( grammatical relations) refer to syntactic relationships between Parts of speech such as subject
• In computer science, an operation is called an instruction. In Computer science, an instruction is a single operation of a processor defined by an Instruction set architecture.
• Military operation, a military action (usually in a military campaign) using deployed forces. This article describes three distinct but related terms military operations Operations as military events and operational level of war
• Covert operation, a military or political action that is both clandestine and denied by the government undertaking the action. A covert operation is a Military or political activity carried out in such a way that the parties responsible for the action can be an Open secret, but
• Sting operation, an operation designed to catch a person committing a crime by means of deception. In law enforcement a sting operation is a Deceptive operation designed to catch a person committing a crime
• Business operations, manufacturing operations, operations management. Business operations are those ongoing recurring activities involved in the running of a business for the purpose of producing value for the stakeholders They are contrasted Manufacturing operations concern the operation of a Facility, as opposed to maintenance Supply and distribution, Health, and Safety Operations management is an area of business that is concerned with the production of goods and services and involves the responsibility of ensuring that Business operations
• Operations Support Systems used in the telecommunications industry
• Operation of law, a legal term that indicates that a right or liability has been created for a part. Operations Support Systems (also called Operational Support Systems or OSS) are computer systems used by telecommunications service providers The phrase " by operation of law " is a Legal term that indicates that a right or liability has been created for a party irrespective of the intent of that party because
• Anomalous operation, in parapsychology, a term describing a broad category of purported paranormal effects. Psi is a term from Parapsychology derived from the Greek, ψ psi twenty-third letter of the Greek alphabet; from the Greek ψυχή
• Musical operations such as transposition, inversion, multiplication, permutation, counterpoint. In Music transposition refers to the process of moving a collection of notes ( pitches) up or down in pitch by a constant interval. In Music theory, the word inversion has several meanings There are inverted chords, inverted melodies, inverted intervals, and This article is about multiplication in Music; for multiplication in Mathematics see Multiplication. In Music, a permutation of a set is a transformation of its Prime form by applying zero or more of certain operations, specifically In Music, counterpoint is the relationship between two or more voices that are independent in contour and Rhythm, and interdependent in Harmony
• Operation (game), a battery-operated game of physical skill. Operation is a battery-operated Game of physical skill that tests players' hand-eye co-ordination A game of skill is a Game where the outcome is determined mainly by mental and/or physical Skill, rather than by pure chance.

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