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.

OPERATION definition: an act or instance, process, or manner of functioning or operating. See examples of operation used in a sentence.

An operation is the process of cutting open someone's body in order to repair, replace, or remove a damaged part.

1. an act or instance, process, or manner of functioning or operating.

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 a …

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

Mar 21, 2026 · Noun operation (countable and uncountable, plural operations) (uncountable) The method by which a device performs its function.

An instance or method of efficient, productive activity. That restaurant is quite an operation.

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