operation Definition

operation
noun

1. An act, method or process of working or operating.
2. The state of working or being active.

Example: The factory is not yet in operation
3. An activity; something done.

Thesaurus: performance, deed, act, enterprise, service, transaction, undertaking.
4. An action or series of actions which have a particular effect.
5. medicine.
Any surgical procedure that is performed in order to treat a damaged or diseased part of the body (often shortened to op).
Thesaurus: surgery, excision, removal.
6. One of a series of military, naval or police, etc actions, usually involving a large number of people, performed as part of a much larger plan (often shortened to op).

Thesaurus: exercise, manoeuvre, campaign, offensive, assault, attack.
Form: operations (often)
7. math.
A specific procedure, such as addition or multiplication, whereby one numerical value is derived from another value or values.
8. computing.
A series of actions that are specified by a single computer instruction.
9. A financial transaction.

Etymology: 14c: French, meaning ‘action' or ‘deed'.