Forbidden City for·bid·den·city uncommon noun 1. the sacred city of Lamaism; known as the Forbidden City for its former inaccessibility and hostility to strangers SynonymsLhasaLassacapital of TibetForbidden City 2. a walled section of Beijing that encloses the palace that was formerly the residence of the emperor of China SynonymsForbidden City Related words Broader terms sectionnational capital Parts BeijingTibet WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.