Mental Disorder: A mental disorder is a syndrome characterized by clinically significant disturbance in an individual's cognition, emotion regulation, or behavior, reflecting a dysfunction in the psychological, biological, or developmental processes underlying mental functioning.
Psychiatric Diagnosis: The process of identifying a mental disorder or condition based on an individual's symptoms, behaviors, and other clinical information, using the criteria outlined in the DSM.
Comorbidity:The co-occurrence of two or more mental disorders or medical conditions in an individual, which can complicate diagnosis and treatment.