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[op-uh-rey-shuh n] /ˌɒp əˈreɪ ʃən/
an act or instance, process, or manner of functioning or operating.
the state of being operative (usually preceded by in or into):
a rule no longer in operation.
the power to act; efficacy, influence, or force.
the exertion of force, power, or influence; agency:
the operation of alcohol on the mind.
a process of a practical or mechanical nature in some form of work or production:
a delicate operation in watchmaking.
a course or procedure of productive or industrial activity:
building operations.
a particular process or course:
mental operations.
a business transaction, especially one of a speculative nature; deal:
a shady operation.
a business, especially one run on a large scale:
a multinational operation.
Surgery. a procedure aimed at restoring or improving the health of a patient, as by correcting a malformation, removing diseased parts, implanting new parts, etc.
  1. a mathematical process, as addition, multiplication, or differentiation.
  2. the action of applying a mathematical process to a quantity or quantities.
  1. a campaign, mission, maneuver, or action.
  2. Usually, operations. the conduct of a campaign, mission, etc.
  3. operations, a headquarters, office, or place from which a military campaign, air traffic to and from an airfield, or any of various other activities, is planned, conducted, and controlled.
  4. operations, the people who work at such a headquarters.
1350-1400; Middle English operacioun < Latin operātiōn- (stem of operātiō), equivalent to operāt(us) (see operate) + -iōn- -ion
Related forms
misoperation, noun
preoperation, noun
reoperation, noun
suboperation, noun Unabridged
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British Dictionary definitions for reoperation


the act, process, or manner of operating
the state of being in effect, in action, or operative (esp in the phrases in or into operation)
a process, method, or series of acts, esp of a practical or mechanical nature
  1. a military or naval action, such as a campaign, manoeuvre, etc
  2. (capital and prenominal when part of a name): Operation Crossbow
  2. a function from a set onto itself
a commercial or financial transaction
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for reoperation



late 14c., "action, performance, work," also "the performance of some science or art," from Old French operacion "operation, working, proceedings," from Latin operationem (nominative operatio) "a working, operation," from past participle stem of operari "to work, labor" (in Late Latin "to have effect, be active, cause"), from opera "work, effort," related to opus (genitive operis) "a work" (see opus). The surgical sense is first attested 1590s. Military sense of "series of movements and acts" is from 1749.

Online Etymology Dictionary, © 2010 Douglas Harper
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reoperation in Medicine

operation op·er·a·tion (ŏp'ə-rā'shən)

  1. A surgical procedure, usually using instruments, for remedying an injury, an ailment, a defect, or a dysfunction.

  2. The act, manner, or process of functioning.

The American Heritage® Stedman's Medical Dictionary
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reoperation in Science
  1. Medicine A surgical procedure for remedying an injury, ailment, defect, or dysfunction.

  2. Mathematics A process or action, such as addition, substitution, transposition, or differentiation, performed in a specified sequence and in accordance with specific rules.

  3. A logical operation.

  4. Computer Science An action resulting from a single instruction.

The American Heritage® Science Dictionary
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