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English definition of “retardation”

retardation

noun [U]     /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.Delaying and wasting timeIncreasing and decreasing speed of motion
(Definition of retardation noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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