operation

US /ˌɑpəˈreʃən/

UK /ˌɒpəˈreɪʃn/

A2TOEIC
n. (c./u.)Noun (Countable/Uncountable)Business or company, or its activities
His operation has been in business for 30 years
n. (c./u.)Noun (Countable/Uncountable)Functioning; use
The lights are in operation now, so thank you for fixing them
n. (c./u.)Noun (Countable/Uncountable)Medical procedure involving surgery
I had an operation to fix my broken leg
n. (c./u.)Noun (Countable/Uncountable)A planned military activity or mission.
The military launched a large-scale operation to secure the border.
n. (c./u.)Noun (Countable/Uncountable)A process or series of actions performed to achieve a specific result.
The operation of the machine requires careful attention to detail.
n. (c./u.)Noun (Countable/Uncountable)A mathematical process, such as addition, subtraction, multiplication, or division.
Addition is a basic arithmetic operation.

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