/ Thesaurus / I Synonyms of inner mongolia Find synonyms for: Noun1. Inner Mongolia, Nei Monggolusage: an autonomous region of northeastern China that was annexed by the Manchu rulers in 1635 and became an integral part of China in 1911WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language