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OPERATION definition: 1. the fact of operating or being active: 2. the way that parts of a machine or system work…. Learn more.

The meaning of OPERATION is performance of a practical work or of something involving the practical application of principles or processes. How to use operation in a sentence.

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Definition of operation noun in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Operation can refer to medical surgery, a military campaign, or mathematical methods, such as multiplication and division. Operation comes from the Latin word opus (“work”) and can refer to …

When a patient has an operation, a surgeon cuts open their body in order to remove, replace, or repair a diseased or damaged part. Charles was at the clinic recovering from an operation on …

Oct 9, 2025 · operation (countable and uncountable, plural operations) (uncountable) The method by which a device performs its function.

Procedure is used especially in medical English, for example by doctors and people who work in hospitals.

There are 18 meanings listed in OED's entry for the noun operation, four of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.