operation
n//ˌɑ.pəˈɹeɪ.ʃən//operation
(uncountable) The method by which a device performs its function.
(countable) A planned undertaking.
(countable, medicine) A surgical procedure.
(computing, logic, mathematics, countable) A procedure for generating a value from one or more other values (the operands).
(military, countable) A military campaign (e.g. Operation Desert Storm).