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Retardation - Wikipedia
Intellectual disability - Wikipedia
Retardation Definition & Meaning - Merriam-Webster
RETARDATION | English meaning - Cambridge Dictionary
RETARDATION Definition & Meaning | Dictionary.com
Retardation - Definition, Meaning & Synonyms | Vocabulary.com
retardation noun - Definition, pictures, pronunciation and usage …
retardation - Wiktionary, the free dictionary
RETARDATION definition and meaning | Collins English Dictionary
Intellectual Disability - WebMD