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


mother tongue

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