Meaning : People collectively who are mentally retarded.
							Example : 
							He started a school for the retarded.
							
Synonyms : developmentally challenged, mentally retarded
Meaning : Relatively slow in mental or emotional or physical development.
							Example : 
							Providing a secure and sometimes happy life for the retarded.
							
Characterized by or characteristic of exceptionally early development or maturity (especially in mental aptitude).
A precocious child.