(also He·ji·ra ) / ˈhedʒɪrə; NAmE ; hɪˈdʒaɪrə/ noun [ sing. ]
1.
(usually the Hegira ) the occasion when Muhammad left Mecca to go to Medina in AD 622
2.
the period which began at this time; the Muslim era
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WORD ORIGIN
via medieval Latin from Arabic hijra departure, from hajara emigrate.