Definition of mother tongue in English:

mother tongue

Syllabification: moth·er tongue

noun

  • The language that a person has grown up speaking from early childhood.
    More 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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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space