Khaleefah

Plural: khulafaa`). Steward, vicegerent; successor. Man is referred to as the khaleefah or steward of God on earth. The word khaleefah was used after the death of the noble Prophet Muhammad to refer to his successor, Aboo Bakr, as head of the Muslim community. Later it came to be accepted as the designation for the head of the Muslim state. Anglicized as caliph