retardation

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retardation mental retardation

Main Entry: re·tar·da·tion
Pronunciation: "rE-"tär-'dA-sh&n, ri-
Function: noun
1 : an act or instance of retarding
2 : the extent to which something is retarded
3 : a musical suspension; specifically : one that resolves upward
4 a : an abnormal slowness of thought or action; also : less than normal intellectual competence usually characterized by an IQ of less than 70 b : slowness in development or progress