Definition of mother tongue in English:

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mother tongue

Pronunciation: /ˈˌməT͟Hər ˈtəNG/

noun

The language that a person has grown up speaking from early childhood.
Example sentences
  • As a rule, interpreters are supposed to translate between their mother tongue and another language.
  • Many immigrants not only learn English in addition to their mother tongue, but also speak other languages.
  • Krio is spoken as a mother tongue by some 250,000 people in and around Freetown and by many more Sierra Leoneans as a second language.
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