[ 'hɛdʒɪrə ]
(also Hejira or Hijra )
■ noun
1》 the departure of Muhammad from Mecca to Medina in AD 622, marking the consolidation of the first Muslim community.
↘the Muslim era reckoned from this date.
2》 ( hegira ) an exodus or migration.
Origin
via med. L. from Arab. hijra 'departure'.