A process in which a doctor cuts into someone's body in order to repair or.. The major difference between the two is that surgery is.
Noun operation (countable and uncountable, plural operations) (uncountable) the method by which a device performs its function.. Operation (noun) operation /ˌɑːpə ˈ reɪʃən/ noun plural operations britannica dictionary definition of operation 1 [count] :