Source : Webster's Revised Unabridged Dictionary (1913)

Rant \Rant\, v. i. [imp. & p. p. {Ranted}; p. pr. & vb. n.
   {Ranting}.] [OD. ranten, randen, to dote, to be enraged.]
   To rave in violent, high-sounding, or extravagant language,
   without dignity of thought; to be noisy, boisterous, and
   bombastic in talk or declamation; as, a ranting preacher.

         Look where my ranting host of the Garter comes! --Shak.

Rant \Rant\, n.
   High-sounding language, without importance or dignity of
   thought; boisterous, empty declamation; bombast; as, the rant
   of fanatics.

         This is a stoical rant, without any foundation in the
         nature of man or reason of things.       --Atterbury.

Source : WordNet®

rant
     n 1: a loud bombastic declamation expressed with strong emotion
          [syn: {harangue}, {ranting}]
     2: pompous or pretentious talk or writing [syn: {bombast}, {fustian},
         {claptrap}, {blah}]
     v : talk in a noisy, excited, or declamatory manner [syn: {mouth
         off}, {jabber}, {spout}, {rabbit on}, {rave}]