Definition of changan:
(n) :
(historical, sometimes proscribed) Alternative spelling of Chang'an, former name of Xi'an: a city, the former capital of China. [(historical) An ancient capital of various Chinese empires, located within present-day Xi'an.]
(n) :
(sometimes proscribed) Alternative form of Chang'an, a district and former county of Xi'an, Shaanxi Province, China. [(historical) An ancient capital of various Chinese empires, located within present-day Xi'an.]