first language
noun/ˌfɜːst ˈlæŋɡwɪdʒ/
/ˌfɜːrst ˈlæŋɡwɪdʒ/
- the language that you learn to speak first as a child; the language that you speak best
- His first language is Welsh.
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first language
Definition of first language noun from the Oxford Advanced Learner's Dictionary