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

Jan 14, 2026 · Noun operation (countable and uncountable, plural operations) (uncountable) The method by which a device performs its function.

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

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

a process of a practical or mechanical nature in some form of work or production: a delicate operation in watchmaking. a course or procedure of productive or industrial activity: building operations.

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

OPERATION meaning: 1 : a process in which a doctor cuts into someone's body in order to repair or remove a damaged or diseased part; 2 : a usually small business or organization

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

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 his arm.