Changan (?t?æ????n) n (Placename) a former name of Xi’anCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Xi?an or Xi’?an or Si?an (??i??n) n. the capital of Shaanxi province, in central China: a capital of China under the Han and T’ang dynasties. 2,760,000. Formerly, Changan. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.