Anglicanism most commonly refers to the beliefs and practices of the Anglican Communion, a world-wide affiliation of Christian Churches. There is no single "Anglican Church" with universal juridical authority, since each national or regional church has full autonomy. As the name suggests, the Anglican Communion is an association of these churches in full communion with the Archbishop of Canterbury. With over seventy-seven million members, the Anglican Communion is the third largest communion in the world, after the Roman Catholic Church and the Eastern Orthodox Churches.