Definition of interlanguage noun from the Oxford Advanced American Dictionary

 

interlanguage

 noun
noun
NAmE//ˈɪntərˌlænɡwɪdʒ//
 
[uncountable, countable](linguistics)
 
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a language system produced by someone who is learning a language, which has features of the language which they are learning and also of their first language
See the Oxford Advanced Learner's Dictionary entry: interlanguage