Mother Tongue Definition

noun
One's native language.
Webster's New World
A language in its relation to another derived from it.
Webster's New World
A parent language.
American Heritage

The language one first learned; the language one grew up with; one's native language.

Wiktionary
Synonyms:

Other Word Forms of Mother Tongue

Noun

Singular:
mother tongue
Plural:
mother-tongues

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mother tongue