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3 definitions found
 for operation
From The Collaborative International Dictionary of English v.0.48 :

  Operation \Op`er*a"tion\, n. [L. operatio: cf. F. op['e]ration.]
     1. The act or process of operating; agency; the exertion of
        power, physical, mechanical, or moral.
        [1913 Webster]
  
              The pain and sickness caused by manna are the
              effects of its operation on the stomach. --Locke.
        [1913 Webster]
  
              Speculative painting, without the assistance of
              manual operation, can never attain to perfection.
                                                    --Dryden.
        [1913 Webster]
  
     2. The method of working; mode of action.
        [1913 Webster]
  
     3. That which is operated or accomplished; an effect brought
        about in accordance with a definite plan; as, military or
        naval operations.
        [1913 Webster]
  
     4. Effect produced; influence. [Obs.]
        [1913 Webster]
  
              The bards . . . had great operation on the vulgar.
                                                    --Fuller.
        [1913 Webster]
  
     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.
        [1913 Webster]
  
     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.
        [1913 Webster]
  
     Calculus of operations. See under Calculus.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  operation
      n 1: the state of being in effect or being operative; "that rule
           is no longer in operation"
      2: a business especially one run on a large scale; "a large-
         scale farming operation"; "a multinational operation"; "they
         paid taxes on every stage of the operation"; "they had to
         consolidate their operations"
      3: a planned activity involving many people performing various
         actions; "they organized a rescue operation"; "the biggest
         police operation in French history"; "running a restaurant is
         quite an operation"; "consolidate the companies various
         operations"
      4: (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"
      5: activity by a military or naval force (as a maneuver or
         campaign); "it was a joint operation of the navy and air
         force" [syn: operation, military operation]
      6: 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" [syn: operation, surgery, surgical operation,
         surgical procedure, surgical process]
      7: 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" [syn: operation, procedure]
      8: process or manner of functioning or operating; "the power of
         its engine determines its operation"; "the plane's operation
         in high winds"; "they compared the cooking performance of
         each oven"; "the jet's performance conformed to high
         standards" [syn: operation, functioning, performance]
      9: (psychology) the performance of some composite cognitive
         activity; an operation that affects mental contents; "the
         process of thinking"; "the cognitive operation of
         remembering" [syn: process, cognitive process, mental
         process, operation, cognitive operation]
      10: (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" [syn:
          mathematical process, mathematical operation,
          operation]
      11: the activity of operating something (a machine or business
          etc.); "her smooth operation of the vehicle gave us a
          surprisingly comfortable ride"

From Moby Thesaurus II by Grady Ward, 1.0 :

  162 Moby Thesaurus words for "operation":
     accomplished fact, accomplishment, achievement, act, acta, acting,
     action, activism, activity, adventure, affair,
     amphibious operations, amputation, anastomotic operation,
     appliance, application, attempt, behavior, bloodless operation,
     blow, bringing to fruition, business, business deal, campaign,
     capital operation, combined operations, commercial transaction,
     commitment, compensating operation, contract, control,
     corneal transplant, coup, crescent operation, deal, dealings, deed,
     direction, doing, doings, dry run, duty, effective, effectuation,
     efficacious, effort, elective operation, emergency operation,
     employment, end use, endeavor, engagement, enterprise, excision,
     execution, exercise, exercising, exertion, exploit, exploitation,
     exploratory operation, fait accompli, feat, fenestration operation,
     fluid operations, function, functional, functioning, gest, go,
     hand, handiwork, handling, heart transplant, immediate purpose,
     in effect, in force, interval operation, job, kidney transplant,
     logistics, major operation, management, managing, maneuver,
     maneuvers, manipulation, measure, military operations,
     minor operation, minor operations, mission, motion, move, movement,
     movements, negotiation, obligation, occupation, office, operating,
     operational, operational purpose, operations, operative,
     organ transplant, organ transplantation, overproduction,
     overseas operations, overt act, package deal, palliative operation,
     passage, performance, plan, play, practice, praxis, procedure,
     proceeding, production, productiveness, program, project,
     proposition, purpose, radical operation, realization, removal,
     res gestae, resection, role, running, section, staff work, step,
     stroke, stunt, surgical intervention, surgical operation,
     surgical technique, swing, task, the knife, thing, thing done,
     tour de force, transaction, transplant, turn, ultimate purpose,
     undertaking, use, using, utilization, venture, war game, war plans,
     work, working, workings, works
  
  

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