A deacon is a member of the diaconate, an office in Christian churches that is generally associated with service of some kind, but which varies among theological and denominational traditions.
Major Christian denominations, such as the Catholic Church, the Oriental Orthodox Churches, the Eastern Orthodox Church, Lutheranism, Presbyterianism, Methodism, and Anglicanism, view the diaconate as an order of ministry.
Clerical celibacy is the requirement in certain religions that some or all members of the clergy be unmarried. Clerical celibacy also requires abstention from deliberately indulging in sexual thoughts and behavior outside of marriage, because these impulses are regarded as sinful. Vows of celibacy are generally required for monks and nuns in Christianity, Buddhism, Hinduism, Jainism and other religions, but often not for other clergy.
Within the Catholic Church, clerical celibacy is mandated for all clergy in the Latin Church except in the permanent diaconate. Exceptions are sometimes admitted for ordination to transitional diaconate and priesthood on a case-by-case basis for married clergymen of other churches or communities who become Catholics, but ordination of married men to the episcopacy is excluded (see Personal ordinariate). Clerical marriage is not allowed and therefore, if those for whom in some particular church celibacy is optional (such as permanent deacons in the Latin Church) wish to marry, they must do so before ordination. Eastern Catholic Churches either follow the same rules as the Latin Church or require celibacy for bishops while allowing priestly ordination of married men.
The sacrament of holy orders in the Catholic Church includes three orders of men: bishops, priests, and deacons, in decreasing order of rank, collectively comprising the clergy. In the phrase "holy orders", the word "holy" means "set apart for a sacred purpose". The word "order" designates an established civil body or corporation with a hierarchy, and ordination means legal incorporation into an order. In context, therefore, a group with a hierarchical structure that is set apart for ministry in the Church.
Men in the last year of seminary training who are seeking ordination as a priest are typically ordained to the "transitional diaconate", while men who are not seeking priestly ordination are instead ordained to the "permanent diaconate". Deacons, whether transitional or permanent, receive faculties to preach, to perform baptisms, and to witness marriages (either assisting the priest at the Mass, or officiating at a wedding not involving a Mass). They may assist at services where Holy Communion is given, such as the Mass, and they are considered the ordinary dispenser of the Precious Blood (the wine) when Communion is given in both types and a deacon is present, but they may not celebrate the Mass themselves. They may officiate at a funeral service not involving a Mass, including a visitation (wake) or the graveside service at burial.After six months or more as a transitional deacon, a man will be ordained to the priesthood. Priests may preach, perform baptisms, witness marriages, hear confessions and give absolutions, anoint the sick, and celebrate the Eucharist or the Mass. Some priests are later chosen to be bishops, who are the ordinary ministers of confirmation and holy orders; bishops may ordain priests, deacons, and other bishops.