Definitions of operation

a business or a part of a business

We improved our performance by boosting marketing operations in growth markets.

a medical procedure in which a doctor cuts into someone's body in order to repair or remove an unhealthy part

Court records from the medical malpractice lawsuit allege that Dr. Claud failed to complete the operation.

an activity that is planned to do or to achieve something

The military attempted a rescue operation recently to free a number of hostages.