Anglicanism is a tradition within Christianity comprising the Church of England and churches which are historically tied to it or hold similar beliefs, worship practices and church structures. The word Anglican originates in ecclesia anglicana, a medieval Latin phrase dating to the Magna Carta (1215) and before, which means the "English Church". Adherents of Anglicanism are called "Anglicans". The great majority of Anglicans are members of churches which are part of the international Anglican Communion. There are, however, a number of churches that are not within the Anglican Communion which also consider themselves to be Anglican, most notably those referred to as Continuing Anglican churches, and those which are part of the Anglican realignment movement.