There are multiple definitions - click on the translation that matches your context.

cirurgia

substantivo

full

operation

noun

Definitions of operation

the fact of being used, being active, or operating

Amazon has celebrated 10 years of operations in China.

a business or a part of a business

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

an activity that is planned to do or to achieve something

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