Imâm is the title of the officer who leads the devotions in Mohammedan mosques, and in Turkey conducts marriage and funeral services, as well as performs the ceremonies connected with circumcision; the office was filled and the title borne by Mahomet, hence it sometimes signifies head of the faith, and is so applied to the Sultan of Turkey; good Mohammedans believe in the future advent of an Imâm—the hidden Imâm—who shall be greater than the Prophet himself.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Imagination * Imaus