One who is oriented in and familiar with a topic or subject; especially, one who is an expert in it.
A new member of an organization.
One who has been through a ceremony of initiation.
To instruct in the rudiments or principles; to introduce.
To do the first act; to perform the first rite; to take the initiative.
To confer membership on; especially, to admit to a secret order with mysterious rites or ceremonies.
To begin; to start.
someone who is expert in the theory of a particular science or art
a theorist