Operation

The act or process of operating; agency; the exertion of power, physical, mechanical, or moral.

The method of working; mode of action.

That which is operated or accomplished; an effect brought about in accordance with a definite plan; as, military or naval operations.

Effect produced; influence.

Something to be done; some transformation to be made upon quantities, the transformation being indicated either by rules or symbols.

Any methodical action of the hand, or of the hand with instruments, on the human body, to produce a curative or remedial effect, as in amputation, etc.

A mathematical process such as addition, subtraction, multiplication, or division

a process or series of acts especially of a practical or mechanical nature involved in a particular form of work; "the operations in building a house"; "certain machine tool operations"

a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body; "they will schedule the operation as soon as an operating room is available"; "he died while undergoing surgery"

(psychology) the performance of some composite cognitive activity; an operation that affects mental contents; "the process of thinking"; "the cognitive operation of remembering"

(mathematics) calculation by mathematical methods; "the problems at the end of the chapter demonstrated the mathematical processes involved in the derivation"; "they were learning the basic operations of arithmetic"

(computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction); "it can perform millions of operations per second"