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English definition of “operation”

operation

noun [C/U] (WORK)   /ˌɑp·əˈreɪ·ʃən/
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). An operation is also an activity planned to achieve something: [C] a rescue operation
(Definition of operation noun (WORK) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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