Which word refers to a failure or defect in a system?

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The term "Fehlfunktion" directly translates to "malfunction" in English, which is a concept that describes a failure or defect within a system. When a system is designed to perform specific functions, any deviation from the expected performance due to errors in components, processes, or operations is categorized as a malfunction. This word effectively encapsulates issues that arise from improper functioning, such as mechanical failures, software bugs, or operational inefficiencies.

In contrast, the other options possess different meanings that do not relate to a failure or defect. "Passfläche" typically refers to a contact surface or area where parts meet; "Triebwerkgondel" is a term associated with an aircraft engine nacelle, and it describes a structural component rather than a malfunction; while "Bezeichnung" means designation or name, referring to the labeling or identification of something, not its operational status. Therefore, "Fehlfunktion" is the most appropriate term to describe a failure within a system.