1 文書を見つけるための辞書。

• lingua franca, interlanguage, koine
• 共通語
• a common language used by speakers of different languages; "Koine is a dialect of ancient Greek that was the lingua franca of the empire of Alexander the Great and was widely spoken throughout the eastern Mediterranean area in Roman times"
• 異なる言語の話し手が使う共通語