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retardation

noun [U]
 
 
/ˌriː.tɑːˈdeɪ.ʃən/ US  /-tɑːr-/ formal

Definition

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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