auxiliary language

noun
🔊/ɔːɡˈzɪliəri læŋɡwɪdʒ/
🔊/ɔːɡˈzɪliəri læŋɡwɪdʒ/
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  1. a language used by speakers of different languages to communicate
    • Esperanto was invented as an auxiliary language.世界语被发明为辅助语言。