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retardation

re·tar·da·tion

retardation

pronunciation:
ri tar deI shn
part of speech: noun
definition 1: slowness or deficiency in mental, physical, or emotional growth.
definition 2: the act of slowing or delaying.
similar words:
lag
definition 3: the condition of being slowed or impeded.
definition 4: something that causes delay; impediment.
derivations: retardative (adj.), retardatory (adj.), retardment (n.)