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Definition of “operation” - English Dictionary

"operation" in American English

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operationnoun

 us   /ˌɑp·əˈreɪ·ʃən/
  • operation noun (MATHEMATICS)

mathematics [C] a ​mathematicalprocess, such as ​addition, in which one set of ​numbers is ​produced from another
  • operation noun (MEDICAL PROCESS)

[C] a ​medicalprocess in which ​doctorscut a ​bodyopen in ​order to ​repair, ​remove, or ​replace an ​unhealthy or ​damagedpart: She ​underwent a six-hour ​open-heart operation.
  • operation noun (WORK)

[C/U] an ​act or ​process of ​working, doing something, being in ​action, or having an ​effect: [U] Several ​printingpresses are in operation (= ​working) at the ​moment. [C] Setting a ​mousetrap is a ​delicate operation (= ​act of doing something). [C/U] An operation is also an ​activityplanned to ​achieve something: [C] a ​rescue operation
(Definition of operation from the Cambridge Academic Content Dictionary © Cambridge University Press)







"operation" in British English

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operationnoun

uk   /ˌɒp.ərˈeɪ.ʃən/  us   /ˌɑː.pəˈreɪ-/
  • operation noun (WORK)

C1 [U] the ​fact of ​operating or being ​active: There are several ​reactors of the ​type in operation (= ​working) at the ​moment. We ​expect the new ​system for ​assessingclaims to come into operation (= ​startworking) early next ​year. [U] the way that ​parts of a ​machine or ​systemwork together, or the ​process of making ​parts of a ​machine or ​systemwork togetherC1 [C] a ​businessorganization: Less ​profitablebusiness operations will have ​difficulty in ​findingfinancialsupport.C1 [C] an ​activity that is ​planned to ​achieve something: a ​military/​peacekeeping operation. Following the ​earthquake, a large-scale rescue operation was launched. [+ to infinitive] The operation tofly in ​supplies will ​begin as ​soon as ​possible.

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  • operation noun (MEDICAL PROCESS)

B1 [C] (UK informal op) an ​occasion when a ​doctorcuts a ​body for ​medicalreasons in ​order to ​repair, ​remove, or ​replace an ​unhealthy or ​damagedpart: a ​major/​minor/​routine operation an ​abdominal/​cataract/​transplant operation He has to have an operation on his ​shoulder. [+ to infinitive] We will ​know in a ​couple of ​days if the operation torestore her ​sight was successful.

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  • operation noun (MATHEMATICS)

[C] specialized mathematics a ​mathematicalprocess, such as ​addition, in which one set of ​numbers is ​produced from another
(Definition of operation from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

"operation" in Business English

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operationnoun

uk   us   /ˌɒpərˈeɪʃən/
[U] the fact of ​operating or being ​active: come into/begin operation We expect the new ​procedure to come into operation early next ​year.be out of/cease operation The ​company was facing a ​courtorder to cease operation. The ​constructionwork will not affect the day-to-day operation of the ​company.in operation There are several ​reactors of this ​type in operation at the moment. We hope to be in ​commercial operation within three months. The ​firm is in its third ​year of operation.
[C] a ​businessorganization: Less ​profitable business operations will have difficulty ​findingfinancialsupport. abanking/​retail/​manufacturing operation We can ​capturecarbonemissions at ​powerplants, ​oilrefineries, and cement-making operations. The group's ​profitsfell, despite a good ​performance from its overseas operations.
operations [U] MANAGEMENT the ​activities involved in a ​companyproducinggoods or ​deliveringservices: Mary ​handles operations and ​travelplanning.head/director of operations He is ​director of operations for a ​recruitmentagency. The operations ​department is ​responsible for ensuring a ​companyoperates as ​efficiently and ​economically as possible.
[C] an ​activity which is ​planned to ​achieve something: an operation to do sth The ​police have ​launched an operation to prevent the ​sale of ​piratedsoftware. A rescue operation to ​save the country's largest ​bank is underway. a ​cost-cutting operation. a military/peacekeeping operation
[U] the way that ​parts of a ​machinework together, or the ​process of making ​parts of a ​machine or ​systemwork together: Teamwork is ​essential to ensure the ​smooth operation of the ​department. Open the ​machine and ​check the operation of the locking ​mechanism.
(Definition of operation from the Cambridge Business English Dictionary © Cambridge University Press)
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“operation” in Business English

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