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extraterrestrial civilization

civilization outside of Earth

en-GB/ˌɛkstɹətəˈɹɛstɹɪəl ˌsɪvɪlaɪˈzeɪʃn/
en-US/ˌɛkstɹətəˈɹɛstɹiəl ˌsɪvəlɪˈzeɪʃən/

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extraterrestrial intelligencecivilization