Also means
surgery
Usage Note
Operación covers a military operation (operación militar), a financial transaction (operación bancaria), a surgical procedure (una operación de rodilla), and a mathematical operation. The verb is operar ('to operate'). In informal speech, una operación often specifically means a surgical operation, so context is important to avoid ambiguity.
Examples
"La operación duró tres horas."
Natural Translation
The surgery lasted three hours.

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