operation

1. The method by which a device performs its function.
2. The method or practice by which actions are done.
3. The act or process of operating; agency; the exertion of power, physical, mechanical, or moral.
4. A planned undertaking.
5. A business or organization.
6. A surgical procedure.
7. A procedure for generating a value from one or more other values (the operands)
8. A procedure for generating a value from one or more other values (the operands)
9. A military campaign (e.g. Operation Desert Storm)
10. (obsolete) Effect produced; influence.