Outer-mongolia definitions

Mongolia (the country)
proper name
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An East Asian region, south of Siberia, west of Manchuria and north of Inner Mongolia (with closely related native Mongolian population), well north of the Great Wall, which never became an integral part of the Chinese empire, and later achieved autonomy and full independence of China, as the republic of Mongolia.
pronoun
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Origin of outer-mongolia

outer (exterior, seen from China) + Mongolia