mother tongue


mother tongue

noun

: the language that a person learns to speak first

Full Definition of MOTHER TONGUE

1
:  one's native language
2
:  a language from which another language derives

Examples of MOTHER TONGUE

  1. <although the anthropologist could speak the local language fairly well, she was always glad to find someone who shared her mother tongue>

First Known Use of MOTHER TONGUE

14th century

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