"first language" in German first language Muttersprache Detailed translations for "first language" first language first language(also: mother tongue, native language, native tongue) die Muttersprache{feminine} I think the person we're looking for's first language isn't English. Source: opensubtitles.org Corpus by OPUS Request review Ich glaube die Muttersprache der Person, die wir suchen ist nicht Englisch. English synonyms for "first language" first language {n} maternal language mother tongue