operation
In German, the word for 'operation' is 'Operation'. This term is used in a similar way to English, referring to a planned medical procedure involving an incision with instruments; performed by a surgeon in an operating room. It can also refer to a military operation, which is a military action usually involving a significant number of personnel.
The operation was a success.
This phrase is used when a surgical procedure or operation has been successfully completed without any complications.
He has an operation tomorrow.
This is a straightforward statement about a future event, specifically a medical operation that is scheduled to happen the next day.
The operation begins at ten o'clock.
This phrase could be used in a medical context to describe the start time of a surgical procedure, or it could be used in a military context to describe the start time of a military operation.