adjective
Of a doctrine, information, etc.: suitable to be imparted to the public without secrecy or other reservations.
Capable of being fully or readily comprehended by the public; accessible; also, having an obvious application.
External.
Having wide currency; popular, prevalent.
noun
A person who is not part of an enlightened inner circle, and not privy to esoteric knowledge; an outsider, an uninitiate.