Source : Webster's Revised Unabridged Dictionary (1913)

Author \Au"thor\ ([add]"th[~e]r), n. [OE. authour, autour, OF.
   autor, F. auteur, fr. L. auctor, sometimes, but erroneously,
   written autor or author, fr. augere to increase, to produce.
   See {Auction}, n.]
   1. The beginner, former, or first mover of anything; hence,
      the efficient cause of a thing; a creator; an originator.

Author \Au"thor\ ([add]"th[~e]r), v. t.
   1. To occasion; to originate. [Obs.]

            Such an overthrow . . . I have authored. --Chapman.

   2. To tell; to say; to declare. [Obs.]

            More of him I dare not author.        --Massinger.

Source : WordNet®

author
     n 1: writes (books or stories or articles or the like)
          professionally (for pay) [syn: {writer}]
     2: someone who originates or causes or initiates something; "he
        was the generator of several complaints" [syn: {generator},
         {source}]

author
     v : be the author of; "She authored this play"