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English definition of “operation”

operation

noun [C]     /ˌɒpərˈeɪʃən/
MEDICAL TREATMENT B1 If you have an operation, a doctor cuts your body to remove or repair part of it: a heart/lung operation a major/minor operation My son's got to have an operation.Surgery
ORGANIZATION an organization or business: a large commercial operationSocieties, clubs and organizationsBusinesses and enterprises
ACTIVITY an activity that is intended to achieve a particular purpose: a military/peacekeeping operation a joint operation by French and Spanish police an operation to smuggle drugs into BritainActing and actsDealing with things or people
in operation If a machine or system is in operation, it is working or being used: The new rail link is now in operation. Most of the machines are now back in operation.FunctioningPerforming a function
(Definition of operation noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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