operation

noun

1. the state of being in effect or being operative

   noun.state

   Examples

   That rule is no longer in operation.

   Source: WordNet 3.0

2. a business especially one run on a large scale

   noun.act

   Examples

   A large-scale farming operation.

   A multinational operation.

   They paid taxes on every stage of the operation.

   They had to consolidate their operations.

   Source: WordNet 3.0

3. a planned activity involving many people performing various actions

   noun.act

   Examples

   They organized a rescue operation.

   The biggest police operation in French history.

   Running a restaurant is quite an operation.

   Consolidate the companies various operations.

   Source: WordNet 3.0

4. (computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction)

   noun.process

   Examples

   It can perform millions of operations per second.

   Source: WordNet 3.0

5. activity by a military or naval force (as a maneuver or campaign)

   noun.act

   Examples

   It was a joint operation of the navy and air force.

   Synonyms military operation

   Source: WordNet 3.0

6. a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body

   noun.act

   Examples

   They will schedule the operation as soon as an operating room is available.

   Synonyms surgery surgical operation surgical procedure surgical process

   Source: WordNet 3.0

7. a process or series of acts especially of a practical or mechanical nature involved in a particular form of work

   noun.act

   Examples

   The operations in building a house.

   Certain machine tool operations.

   Synonyms procedure

   Source: WordNet 3.0

8. process or manner of functioning or operating

   noun.process

   Examples

   The power of its engine determines its operation.

   The plane's operation in high winds.

   Synonyms functioning performance

   Source: WordNet 3.0

9. (psychology) the performance of some composite cognitive activity; an operation that affects mental contents

   noun.cognition

   Examples

   The cognitive operation of remembering.

   Synonyms cognitive operation cognitive process mental process process

   Source: WordNet 3.0

10. (mathematics) calculation by mathematical methods

    noun.act

    Examples

    They were learning the basic operations of arithmetic.

    Synonyms mathematical operation mathematical process

    Source: WordNet 3.0

11. the activity of operating something (a machine or business etc.)

    noun.act

    Examples

    Her smooth operation of the vehicle gave us a surprisingly comfortable ride.

    Source: WordNet 3.0

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

    noun

    Source: webster1913