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Operation

ˌɒpəˈreɪʃn

Operation definitions
noun
operation operations
  1. the action of functioning or the fact of being active or in effect

    "restrictions on the operation of market forces"

    • an active process; a discharge of a function

      "the operations of the mind"

  2. an act of surgery performed on a patient

    "I've never felt better since my bypass operation"

    surgery surgical operation surgical intervention major surgery minor surgery
  3. an organized activity involving a number of people

    "a rescue operation"

    • a business organization; a company

      "he reopened his operation under a different name"

    • an activity in which a business is involved

      "the company is selling most of its commercial banking operations"

  4. 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