This is the 2402nd most frequent German word.
operation
"Operation" in German means "surgery" or "military/technical operation."
Used in the context of medical surgery.
Die Operation des Patienten verlief erfolgreich.
The patient's surgery was successful.
Used in the context of an organized activity or military-like operation.
Die Operation zur Rettung war sorgfältig geplant.
The rescue operation was carefully planned.
Used in the context of a mathematical procedure, such as addition or subtraction.