The Collaborative International Dictionary of English v.0.48:

Rave \Rave\ (r[=a]v), v. i. [imp. & p. p. Raved (r[=a]vd); 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.
      [1913 Webster]

            In our madness evermore we rave.      --Chaucer.
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            Have I not cause to rave and beat my breast?
                                                  --Addison.
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            The mingled torrent of redcoats and tartans went
            raving down the valley to the gorge of
            Killiecrankie.                        --Macaulay.
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   2. To rush wildly or furiously. --Spenser.
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   3. To talk with unreasonable enthusiasm or excessive passion
      or excitement; -- followed by about, of, or on; as, he
      raved about her beauty.
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            The hallowed scene
            Which others rave of, though they know it not.
                                                  --Byron.
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The Collaborative International Dictionary of English v.0.48:

Raving \Rav"ing\ (r[=a]v"[i^]ng), a.
   Talking irrationally and wildly; as, a raving lunatic. --
   Rav"ing*ly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

raving
    adv 1: in a raving manner; "raving mad" [syn: raving,
           ravingly]
    n 1: declaiming wildly; "the raving of maniacs"