Dictionary

noun

Definitions

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

   Example: His mother tongue is a relatively conservative dialect of Aramaic.

   Synonyms:L1first languagemother languagenative languagenative tongue
   Antonyms:father tongue

2. The language spoken by one’s ancestors.

3. The language spoken by one's mother, when it differs from that spoken by one's father.

   Antonyms:father tongue

4. Informal speech, as opposed to educated language.

   Antonyms:father tongue