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English definition of “retardation”

retardation

noun [U] uk   /ˌriː.tɑːˈdeɪ.ʃən/ us    /-tɑːr-/ formal
slow development, or development that is slower than it should be: Severe iron deficiency can cause developmental delay and growth retardation.
(Definition of retardation from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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