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op·er·a·tion

operation

 
 
pronunciation:
a p reI shn
part of speech: noun
definition 1: the act or process of working or running.
This factory has been in operation for many years.
synonyms:
effect, functioning, performance
similar words:
action, use
definition 2: a process in which a doctor repairs or removes a part of the body.
She had an operation on her lung.