To be added to the fundamentals:
Authority: 1. To be the author of words or works. 2. A has authority from B if B asks A to give forth words or works.
Keys: items of knowledge which serve to unlock the hidden meaning of things.
Priest: one sent forth to teach the commandments of God, having an understanding of the spirit of prophecy, who may also perform rites.
Priesthood: To be in association (or of a society - friends and family) with the powers of heaven. The fulness of the priesthood is to be in association with the Most High God.