Mental retardation term has been replaced by:
American Psychiatric Association (APA) is responsible for naming, defining, and describing mental disorders. In the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM - 5), the APA replaced "Mental retardation" with "Intellectual disability (intellectual developmental disorder)".
Mental deficiency
Mental lack
Mentally challenged
Intellectual disability
Definition and Concepts in Sociology & Psychology