Source : Webster's Revised Unabridged Dictionary (1913)

Exoteric \Ex`o*ter"ic\, Exoterical \Ex`o*ter"ic*al\a. [L.
   exotericus, Gr. ? fr. ? out: cf. F. exot['e]rique. See {Ex}-]
   External; public; suitable to be imparted to the public;
   hence, capable of being readily or fully comprehended; --
   opposed to esoteric, or secret.

         The foppery of an exoteric and esoteric doctrine. --De
                                                  Quincey.

Source : WordNet®

exoteric
     adj : suitable for the general public; "writings of an exoteric
           nature" [ant: {esoteric}]