first language
🇺🇸
/ˌfɜːrst ˈlæŋɡwɪdʒ/
🇬🇧
/ˌfɜːst ˈlæŋɡwɪdʒ/
The first language you learn as a child and speak best.
Her first language is Spanish, which she learned from her family as a young child.