Enthronement is the rite by which a ruling bishop is installed in his cathedral. At the enthronement, his rule of his diocese officially begins and he is accorded the title appropriate to his new see.
The enthronement is usually presided over by the primate of the region or by another senior bishop on behalf of the primate. In the case of the enthronement of the new head of an autocephalous church, the most senior member of the Holy Synod (other than the candidate himself) will usually preside over the enthronement.
Enthronement is a separate rite from the consecration of a bishop, in which a priest is made a bishop.