verb
(transitive) To begin; to start.
(transitive) To instruct in the rudiments or principles; to introduce.
(transitive) To confer membership on; especially, to admit to a secret order with mysterious rites or ceremonies.
(intransitive) To do the first act; to perform the first rite; to take the initiative.
noun
A new member of an organization.
One who has been through a ceremony of initiation.
One who is oriented in and familiar with a topic or subject; especially, one who is an expert in it.
adjective
(obsolete) Unpracticed, untried, new.
(obsolete) Begun, commenced, introduced to or in the rudiments (of), newly admitted.