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This was the biggest military operation for 20 years.
Undercover operations led to the arrest of the gang.
The cleanup operation will take weeks.
a stomach/heart operation
She may need an operation on her knee.
The baby had to have an operation, but he's fine now.
A very experienced heart surgeon will perform the operation.
We are visiting schools to explain the operation of the new exam system.
This is the British English definition of operation. View American English definition of operation.