Coming from the Latin, initiation implies a beginning. The related term, initiate, means to begin or start a particular action, event, circumstance , or happening. But it is also an ending as existence on one level drops away in an ascension to the next.
An initiation is also a ceremony by which a person is introduced into a society, or other organized body, especially the rite of admission into a secret society or order.
Normally an initiation rite would imply a shepherding process where those who are at a higher level guide the initiate through a process of greater exposure of knowledge. This may include the revelation of secrets, usually reserved for those at the higher level of understanding.
See also: Rite of passage.