Definition of motherese noun from the Oxford Advanced Learner's Dictionary

 

motherese

 noun
noun
BrE BrE//ˌmʌðəˈriːz//
 
; NAmE NAmE//ˌmʌðəˈriːz//
 
[uncountable]
 
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a simple style of language of the type that parents use when speaking to their child
See the Oxford Advanced American Dictionary entry: motherese