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English definition of “operation”

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operation

noun  /ˌɑp·əˈreɪ·ʃən/ us  

operation noun (MATHEMATICS)

mathematics [C] a mathematical process, such as addition, in which one set of numbers is produced from another

operation noun (MEDICAL PROCESS)

[C] a medical process in which doctors cut a body open in order to repair, remove, or replace an unhealthy or damaged part: She underwent a six-hour open-heart operation.

operation noun (WORK)

[C/U] an act or process of working, doing something, being in action, or having an effect: [U] Several printing presses are in operation (= working) at the moment. [C] Setting a mousetrap is a delicate operation (= act of doing something). [C/U] An operation is also an activity planned to achieve something: [C] a rescue operation
(Definition of operation from the Cambridge Academic Content Dictionary © Cambridge University Press)
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