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Definitions of APD:
noun: Initialism of antisocial personality disorder. [(psychology) A personality disorder marked by antisocial behavior, a pervasive pattern of disregard for and violation of the rights of others that begins in childhood or early adolescence and continues into adulthood.]
noun: (medicine) Initialism of auditory processing disorder. [(medicine) an umbrella term for a variety of disorders that affect the way the brain processes auditory information; it is generally differentiable from aphasia in that aphasia is by definition caused by acquired brain injury, whereas auditory processing disorder is principally neurodevelopmental.]