Baptize (verb)

1. To administer the sacrament of baptism to someone by immersing them in water or pouring water over their head as a sign of their admission to the Christian community.
2. To initiate someone into a religion or organization through a ritual of washing with water.
3. To purify or consecrate someone through a ritual of washing with water.

Origin:

From late latin baptizare, from greek baptizein, from baptein "to dip, to immerse".

Examples:

1. The baby was baptized by the priest.
2. The convert was baptized into the Christian faith.
3. The couple decided to baptize their child in the river.
4. The group was baptized into the new organization.
5. The young man was baptized into the Catholic Church.