first language

noun
🔊/ˌfɜːst ˈlæŋɡwɪdʒ/
🔊/ˌfɜːrst ˈlæŋɡwɪdʒ/
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  1. the language that you learn to speak first as a child; the language that you speak best母语;第一语言
    • His first language is Welsh.他的母语是威尔士语。🔊🔊
    compare second language