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English definition of “operation”

operation

noun [C] (MATHEMATICS)    /ˌɒp.ərˈeɪ.ʃən/ US  /ˌɑː.pəˈreɪ-/ specialized
a mathematical process , such as addition , in which one set of numbers is produced from anotherCalculations and calculatingAddition, subtraction, multiplication and division
(Definition of operation noun (MATHEMATICS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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