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retardation

   Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia, Hutchinson 0.04 sec.
retardation /re·tar·da·tion/ (re?tahr-da´shun) delay; hindrance; delayed development.
fetal growth retardation , intrauterine growth retardation (IUGR) birth weight below the tenth percentile for gestational age for infants born in a given population, defined as symmetric (both weight and length below normal) or asymmetric (weight below normal, length normal).
mental retardation  a mental disorder characterized by significantly subaverage general intellectual functioning associated with impairment in adaptive behavior and manifested in the developmental period; classified according to IQ as mild (50–70), moderate (35–50), severe (20–35), and profound (less than 20).
psychomotor retardation  generalized slowing of mental and physical activity.

re·tar·da·tion (rtär-dshn)
n.
1. The condition of being relatively slow in mental, emotional, or physical development.
2. The extent to which something is held back or delayed.
3. Mental retardation.

retardation,

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