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Khitan or Kitan ( in large script or in small, "Khitai"; , "Qìdānyǔ"), also known as Liao, is a now-extinct language once spoken in northeast Asia by the Khitan people (4th to 13th century). It was the official language of the Liao Empire (907–1125) and the Qara Khitai (1124–1218).