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The term that best describes when an authorized subject is incorrectly accepted as valid is known as the False Accept Rate (FAR). This measure is crucial in biometric systems and access control because it reflects the frequency with which the system incorrectly identifies an unauthorized individual as one who is authorized.

A higher False Accept Rate indicates that the system is less secure, as it may allow unauthorized access. For instance, if a biometric system is designed to recognize fingerprints, a high FAR means that someone's fingerprint, who should not have access, is mistakenly accepted as legitimate. Monitoring and minimizing the FAR is vital for ensuring the integrity and security of access control systems.

Understanding the implications of this rate is essential in the design and evaluation of security systems, as it helps assess how effectively the system distinguishes between authorized and unauthorized individuals.