Source : Webster's Revised Unabridged Dictionary (1913)

Rave \Rave\, v. i. [imp. & p. p. {Raved}; p. pr. & vb. n.
   {Raving}.] [F. r[^e]ver to rave, to be delirious, to dream;
   perhaps fr. L. rabere to rave, rage, be mad or furious. Cf.
   {Rage}, {Reverie}.]
   1. To wander in mind or intellect; to be delirious; to talk
      or act irrationally; to be wild, furious, or raging, as a
      madman.

            In our madness evermore we rave.      --Chaucer.

            Have I not cause to rave and beat my breast?
                                                  --Addison.

            The mingled torrent of redcoats and tartans went
            raving down the valley to the gorge of Kiliecrankie.
                                                  --Macaulay.

   2. To rush wildly or furiously. --Spencer.

   3. To talk with unreasonable enthusiasm or excessive passion
      or excitement; -- followed by about, of, or on; as, he
      raved about her beauty.

            The hallowed scene Which others rave on, though they
            know it not.                          --Byron.

Raving \Rav"ing\, a.
   Talking irrationally and wildly; as, a raving lunatic. --
   {Rav"ing*ly}, adv.

Source : WordNet®

raving
     adj : talking or behaving irrationally; "a raving lunatic" [syn: {raving
           mad}, {wild}]

raving
     n : declaiming wildly; "the raving of maniacs"
     adv : in a raving manner; "raving mad" [syn: {ravingly}]