Definition:
The Hijra, also known as Hijraj, Hijrat, or Hegira (the last being a Latinate term), is the migration of the Islamic prophet Muhammad and his retinue from Mecca to Medina, which occurred in 622 CE. It was designated the first year of the Islamic calendar by Umar bin al-Khattab (the prophet Muhammad's companion and the second Muslim Caliph after Muhammad's death) in 638 CE [17 AH].
The Hijra, also known as Hijraj, Hijrat, or Hegira (the last being a Latinate term), is the migration of the Islamic prophet Muhammad and his retinue from Mecca to Medina, which occurred in 622 CE. It was designated the first year of the Islamic calendar by Umar bin al-Khattab (the prophet Muhammad's companion and the second Muslim Caliph after Muhammad's death) in 638 CE [17 AH].