Definition of reduplicative adjective from the Oxford Advanced Learner's Dictionary

 

reduplicative

 adjective
adjective
BrE BrE//ˌriːˈdjuːplɪkeɪtɪv//
 
; NAmE NAmE//ˌriːˈduːplɪkeɪtɪv//
 
 
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(used about words) repeating a syllable or other part of the word, often with a slight change Reduplicative expressions like ‘mishmash’ and ‘nitty gritty‘ illustrate the playful nature of English.