Operation

Op`er*a"tion

(?), n. [L. operatio: cf. F. opration.] 1. The act or process of operating; agency; the exertion of power, physical, mechanical, or moral.
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The pain and sickness caused by manna are the effects of its operation on the stomach.
Locke.
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Speculative painting, without the assistance of manual operation, can never attain to perfection.
Dryden.
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2. The method of working; mode of action.
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3. That which is operated or accomplished; an effect brought about in accordance with a definite plan; as, military or naval operations.
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4. Effect produced; influence. [Obs.]
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The bards . . . had great operation on the vulgar.
Fuller.
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5. (Math.) Something to be done; some transformation to be made upon quantities or mathematical objects, the transformation being indicated either by rules or symbols.
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6. (Surg.) 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.
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Calculus of operations. See under Calculus.
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Tue 18th December 2018