mother tongue

His mother tongue is a relatively conservative dialect of Aramaic.

Questions about respondents' place of birth, their parents' place of birth, nativity, and language use (called “mother tongue” and “father tongue”) were added to the Census between 1850 and 1960.

The other is the maturity and experience of that; if that is our mother tongue, this is our father tongue, a reserved and select expression, too significant to be heard by the ear, which we must be born again in order to speak.