English

Definition of mother tongue noun from the Oxford Advanced Learner's Dictionary

 

mother tongue

 noun
noun
BrE BrE//ˌmʌðə ˈtʌŋ//
 
; NAmE NAmE//ˌmʌðər ˈtʌŋ//
 
 
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the language that you first learn to speak when you are a child synonym first language
See the Oxford Advanced American Dictionary entry: mother tongue