English

Definition of first language noun from the Oxford Advanced Learner's Dictionary

 

first language

 noun
noun
BrE BrE//ˌfɜːst ˈlæŋɡwɪdʒ//
 
; NAmE NAmE//ˌfɜːrst ˈlæŋɡwɪdʒ//
 
 
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the language that you learn to speak first as a child; the language that you speak best His first language is Welsh. compare second language
See the Oxford Advanced American Dictionary entry: first language