Convert

1. A person who is converted from one opinion or practice to another; a person who is won over to, or heartily embraces, a creed, religious system, or party, in which he has not previously believed; especially, one who turns from the controlling power of sin to that of holiness, or from unbelief to Christianity.
2. A lay friar or brother, permitted to enter a monastery for the service of the house, but without orders, and not allowed to sing in the choir.