retardation

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retardation /ˌriːˌtɑɚˈdeɪʃən/ noun
retardation
/ˌriːˌtɑɚˈdeɪʃən/
noun
Learner's definition of RETARDATION
[noncount]
old-fashioned + sometimes offensive : an unusual slowness of mental development
formal : an act of slowing down the development or progress of something
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