Inner Mongolia also Nei Mong·gol (n?? m?n?g?l?, m?ng?-) An autonomous region of northeast China. Originally the southern section of Mongolia, it was annexed by the Manchus in the 1600s, later becoming an integral part of China. Hohhot is the capital.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Inner Mongolia n (Placename) an autonomous region of NE China: consists chiefly of the Mongolian plateau, with the Gobi Desert in the north and the Great Wall of China in the south. Capital: Hohhot. Pop: 23 800 000 (2003 est). Area: 1 177 500 sq km (459 225 sq miles) Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014In?ner Mongo?lia n. an autonomous region in NE China, adjoining the Mongolian People’s Republic. 22,600,000; 454,600 sq. mi. (1,177,400 sq. km). Cap.: Hohhot. Official name, In?ner Mongo?lia Auton?omous Re?gion. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.