operation /ˌɑːpəˈreɪʃən/ noun plural operations
plural operations
Learner's definition of OPERATION
1
[count] : a process in which a doctor cuts into someone's body in order to repair or remove a damaged or diseased part手术 -
She is recovering from a major heart operation. [=she is recovering from major heart surgery]她做了一次心脏的大手术，正在恢复中。
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a minor/routine operation小/常规手术
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organ transplant operations器官移植手术
2 [count]
a : a usually small business or organization（通常规模较小的）企业，公司。 b : an activity of a business or organization（企业、公司的）运营，业务活动 —
usually plural通常用复数 3
[noncount] : the state of functioning or being used运转；运行 —
used with in or into与in或into连用 -
The system is now in operation.这个系统正在运行中。
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The mill has been in operation for over 100 years.这家磨坊已经经营100多年了。
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Safety goggles must be worn while the machine is in operation. [=in use]机器运转中必须佩戴护目镜。
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The dam will go into operation next month.大坝将于下个月投入使用。
4
[noncount] : the way something functions or is used运行方式；操作方式 5
[count] : a set of planned actions for a particular purpose（有计划、有目的的）行动，活动 -
The city has launched an operation to clean up the neighborhood.这个城市发起了一场清扫街区的活动。
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Ten arrests were made in an undercover operation.在一次秘密行动中有十人被捕。
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a rescue operation营救行动
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The military operation gave them control of the city.军事行动让他们获得了城市的控制权。
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peacekeeping operations维和行动
6
[count] : a single action performed by a computer（计算机）操作，运算 7
[noncount] : the act of using and controlling something操作；操控 8
[count] mathematics : a mathematical process (such as addition or multiplication) that is used for getting one number or set of numbers from others according to a rule运算