wiki說的，secular clergy

http://en.wikipedia.org/wiki/Secular_clergy

In the Catholic Church, the secular clergy are clergy, ministers, such as deacons and priests, who do not belong to a religious institute. While regular clergy take religious vows of chastity, poverty, and obedience and follow the rule of life of the institute to which they belong, secular clergy do not take vows, and they live in the world at large, rather than a religious institute (saeculum). Canon law makes specific demands on clergy, whether regular or secular, quite apart from the obligations consequent to religious vows.