mother tongue

Mother tongue is defined as the first language that a person learns and the language used in that person's home country.

(noun)

An example of mother tongue is English for someone born in America.

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See mother tongue in Webster's New World College Dictionary

  1. one's native language
  2. a language in its relation to another derived from it

See mother tongue in American Heritage Dictionary 4

noun
  1. One's native language.
  2. A parent language.

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