A personal ordinariate, sometimes called a "personal ordinariate for former Anglicans" or more informally an "Anglican ordinariate", is a canonical structure within the Catholic Church established in accordance with the apostolic constitution Anglicanorum Coetibus of 4 November 2009 and its complementary norms. The ordinariates were established in order to enable "groups of Anglicans" to join the Catholic Church while preserving elements of their liturgical and spiritual patrimony. They are juridically equivalent to diocese, "a particular church in which and from which exists the one and unique Catholic Church", but may be erected in the same territory as other dioceses "by reason of the rite of the faithful or some similar reason".
Three ordinariates currently exist:
"Personal ordinariate" is the term used for each of the three existing ordinariates in the decree that established them: the Personal Ordinariate of Our Lady of Walsingham, the Personal Ordinariate of the Chair of Saint Peter and the Personal Ordinariate of Our Lady of the Southern Cross. It is also the collective name given to all three in the official yearbook of the Holy See and is a name the ordinariates themselves use.
"Ordinariates for former Anglicans" is a term sometimes used by the ordinariates themselves, by news sources (but not official documents) of the Holy See and episcopal conferences. This terminology, however, does not mean that an ordinariate's membership exclusively comprises former Anglicans. The head of the North American ordinariate has said that "ordinariates for former Anglicans must be a bridge to Christian unity and a force for true ecumenism" and the members must "build and rebuild our relationships with confreres who have stayed behind in the Anglican Church".
"Anglican ordinariates" is often used by newspapers, such as the Church of England Newspaper and the Canadian Catholic Register. It is also often used by communities belonging to the ordinariates. The name does not imply that the members of an ordinariate are still Anglicans. While those who have been Anglicans "bring with them, into the full communion of the Catholic Church in all its diversity and richness of liturgical rites and traditions, aspects of their own Anglican patrimony and culture which are consonant with the Catholic Faith", they are "Catholics of the Latin Rite, within the full communion of the Catholic Church ... no longer part of any other communion".