The method by which a device performs its function.
It is dangerous to look at the beam of a laser while it is in operation.
The method or practice by which actions are done.
A planned undertaking.
The police ran an operation to get vagrants off the streets.
The Katrina relief operation was considered botched.
A business or organization.
We run our operation from a storefront.
They run a multinational produce-supply operation.
(medicine) a surgical procedure.
She had an operation to remove her appendix.
(mathematics) a procedure for generating a value from one or more other values (the operands; the value for any particular operands is unique)
(military) a military campaign (w:Operation Desert Storm)