initiate
/i-ˈni-shē-ˌāt/
verb
to induct into membership by or as if by special rites
to instruct in the rudiments or principles of something : introduce
initiate a program of reform
noun
a person who is undergoing or has undergone an initiation
a person who is instructed or adept in some special field
adjective
initiated or properly admitted (as to membership or an office)
instructed in some secret knowledge
relating to an initiate