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noun
1.
an act or instance, process, or manner of functioning or operating.
2.
the state of being operative (usually preceded by in or into):
a rule no longer in operation.
3.
the power to act; efficacy, influence, or force.
4.
the exertion of force, power, or influence; agency:
the operation of alcohol on the mind.
5.
a process of a practical or mechanical nature in some form of work or production:
a delicate operation in watchmaking.
6.
a course or procedure of productive or industrial activity:
building operations.
7.
a particular process or course:
mental operations.
8.
a business transaction, especially one of a speculative nature; deal:
a shady operation.
9.
a business, especially one run on a large scale:
a multinational operation.
10.
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.
11.
Mathematics.

a mathematical process, as addition, multiplication, or differentiation.
the action of applying a mathematical process to a quantity or quantities.

12.
Military.

a campaign, mission, maneuver, or action.
Usually, operations. the conduct of a campaign, mission, etc.
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.
operations, the people who work at such a headquarters.

noun
1.
the act, process, or manner of operating
2.
the state of being in effect, in action, or operative (esp in the phrases in or into operation)
3.
a process, method, or series of acts, esp of a practical or mechanical nature
4.
(surgery) any manipulation of the body or one of its organs or parts to repair damage, arrest the progress of a disease, remove foreign matter, etc
5.

a military or naval action, such as a campaign, manoeuvre, etc
(capital and prenominal when part of a name): Operation Crossbow

6.
(maths)

any procedure, such as addition, multiplication, involution, or differentiation, in which one or more numbers or quantities are operated upon according to specific rules
a function from a set onto itself

7.
a commercial or financial transaction

operation op·er·a·tion (ŏp’ə-rā’shən)
n.

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

The act, manner, or process of functioning.

operation
(ŏp’ə-rā’shən)

Medicine A surgical procedure for remedying an injury, ailment, defect, or dysfunction.

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

A logical operation.

Computer Science An action resulting from a single instruction.