operation
/ˌɒpəˈreɪʃən/noun
1
- mass noun the fact or condition of functioning or being active运作; 实施：
the construction and operation of power stations
电站的建设和运行
some of these ideas could be put into operation.
这些主意中的一部分可以付诸实施。
2
- an act of surgery performed on a patient手术。
3
- often with adj. or noun modifier a piece of organized and concerted activity involving a number of people, especially members of the armed forces or the police（尤指军事）行动：
a rescue operation.
救援行动。
3.1
Operation
preceding a code name for such an activity用于代号之前行动：Operation Desert Storm.
沙漠风暴行动。
3.2
- a business organization; a company商业机构; 公司：
he reopened his operation under a different name.
他用不同的名字重新开了他的公司。
3.3
- an activity in which such an organization is involved经营业务：
the company is selling most of its continental commercial banking operations.
那家公司正在出售它大部分的大陆商业银行业务。
3.4
- an active process; a discharge of a function运转; （功能的）履行：
the operations of the mind.
头脑的运转。
4
- Mathematics a process in which a number, quantity, expression, etc., is altered or manipulated according to set formal rules, such as those of addition, multiplication, and differentiation【数】运算。
词源
late Middle English: via Old French from Latin operatio（n-）, from the verb operari 'expend labour on' （see OPERATE）.