名詞 interlanguage:

1. a common language used by speakers of different languages
   同義詞：lingua franca, koine

in.ter.lan.guage

n.（名詞）
The type of language produced by nonnative speakers in the process of learning a second language or foreign language.
人工輔助語言：一種由非本族語使用者在學(xué)習(xí)第二語言或外語的過程中形成的語言
A lingua franca.
通用語