noun
the state of being delayed or held back in terms of progress or development
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Intellectual retardation is a condition characterized by significant limitations in intellectual functioning and adaptive behavior.
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The doctor explained that the child's mental retardation may require specialized education and support.
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Using the term 'retardation' as an insult is offensive and disrespectful.
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The economic retardation of the region was evident in the lack of infrastructure development.