Medical Dictionary
retardation
noun re·tar·da·tion \ˌrē-ˌtär-ˈdā-shən, ri-\
Medical Definition of RETARDATION
1
: an abnormal slowness of thought or action; especially : mental retardation
2
: slowness in development or progress
Seen & Heard
What made you want to look up retardation? Please tell us where you read or heard it (including the quote, if possible).