Perennial:  Perpetual or everlasting.  Perennial truths are universally valid for all mankind, throughout history.

Tradition:  An arrangement of symbols and rites which transmit perennial truths.

Lineage:  A chain of beings who articulate a particular tradition.

Initiation:  Inclusion within a lineage.

Adept:  Skillful. In this context, one who can relate traditional forms to perennial truths.

Master:  One who embodies the perennial truths indicated by a tradition.  A source of tradition.

Religion:  Traditional myths, stories and rites without necessarily any connection to meaning and perennial truth.