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Incardination is the formal term in the Catholic Church for a clergyman being under a bishop or other ecclesiastical superior. It is also sometimes used to refer to laity who may transfer to another part of the church, from say the Western Latin Church to an Eastern Catholic Church or from a territorial diocese to one of the three personal ordinariates for former Anglicans.
As one part of the hierarchy of the Catholic Church, every Catholic priest or deacon must have an ordinary as a superior. Such an ordinary is most often a diocesan bishop, but can also be a leader of a religious order, such as the Jesuits or Franciscans, or some other ecclesiastical superior.
The purpose of incardination is to ensure that no cleric is "freelance", without a clear ecclesiastical superior to whom the cleric is accountable and who is in turn is responsible for the cleric.
Incardination does not cease until the moment when that cleric is incardinated as a subject of another superior. An excardination from one diocese, for instance, does not become effective until the moment of incardination to another, so there is no gap during which the clergyman is not clearly answerable to a definitely determined superior.
A priest or deacon may move from diocese to diocese taking a new position, including moving to a new country, while formally still being incardinated in his original diocese, and therefore still under the supervision of his original diocese's bishops, at least formally, by Canon Law. For instance, a Philippine diocesan priest may be assigned to a parish in the United States for decades but still be formally incardinated in his original Philippine diocese. An example of when the formal incardination matters is the case of Fr. Frank Pavone who headed Priests for Life. Though Priests for Life was headquartered in New York City, Fr. Frank Pavone was incardinated in the Roman Catholic Diocese of Amarillo, and so when questions were raised about Fr. Pavone's activities, it was the bishop of Amarillo who investigated initially, not the archbishop of New York. Fr. Pavone has also refused to answer questions about his official incardination and the Bishop of Amarillo declared him to be not in good standing.
Incardination is dealt with in canons 265-272 of the Code of Canon Law.
There is a similar canonical institution in the law of the Eastern Catholic Churches, which appears in the Code of Canons of the Eastern Churches, Title X «Clerics», Chapter II «Ascription of Clerics to an Eparchy», Canons 357-366.
Questions of civil jurisdiction can come into conflict with canon law in situations where a priest is on temporary assignment remotely while he remains incardinated to his diocese of origin. This was the case in the case of a French priest involved in a car accident which killed two people, while at his temporary post in California. The question arose in a civil suit, whether the Diocese of Fresno (California) where he was working was responsible legally, although the priest remained incardinated in France. The civil court ruled that it was.
Its antonym, excardination, denotes that a member of the clergy has been freed from one jurisdiction and is transferred to another.
Both terms are derived from the Latin cardo (pivot, socket, or hinge), from which the word cardinal is also derived—hence the Latin verbs incardinare (to hang on a hinge or fix) and excardinare (to unhinge or set free).
During the ordination ceremony, prior to the actual sacrament of Holy Orders itself, the man places himself under a promise of obedience to his bishop or other ordinary of a particular church, or makes an acknowledgment of a pre-existing vow of obedience to a prior, abbot, or other superior in an institute of consecrated life or society of apostolic life.