Hegira
noun [ S ] (also Hejira) uk/ˈhedʒ.ɪ.rə/ /hɪˈdʒaɪ.rə/ us/ˈhedʒ.ɪ.rə/ us/hɪˈdʒaɪ.rə/
伊斯兰先知穆罕默德从麦加逃亡到麦地那;伊斯兰元年
the occasion in AD 622 when the prophet Muhammad left Mecca and travelled to Medina. This date is the one from which the Islamic system of counting years is calculated.
The citizens of Medina received and supported Muhammad following the Hegira. 麦地那的公民欢迎从麦加逃亡而来的穆罕默德。