What is the meaning of the word "operation"?

Definitions:

(computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction) noun
- it can perform millions of operations per second
(psychology) the performance of some composite cognitive activity noun
- an operation that affects mental contents
a business especially one run on a large scale noun
- a largescale farming operation
a planned activity involving many people performing various actions noun
- they organized a rescue operation
a process or series of acts especially of a practical or mechanical nature involved in a particular form of work noun
- the operations in building a house
activity by a military or naval force (as a maneuver or campaign) noun
- it was a joint operation of the navy and air force
process or manner of functioning or operating noun
- the power of its engine determines its operation
the activity of operating something such as a machine or business noun
- The smooth operation of the vehicle gave us a surprisingly comfortable ride.
the state of being in effect or being operative noun
- that rule is no longer in operation