i‧ni‧ti‧a‧tion [uncountable and countable]
the process of officially introducing someone into a club or group, or of introducing a young person to adult life, often with a special ceremony:
The club has an initiation ceremony for new members.
initiation rituals for young boys at puberty
rites of initiation into their religion
the act of starting something such as an official process, a new plan etc
the initiation of criminal proceedings