The Collaborative International Dictionary of English v.0.48:

Rabble \Rab"ble\, n. [Probably named from the noise made by it
   (see Rabble, v. i.) cf. D. rapalje rabble, OF. & Prov. F.
   rapaille.]
   1. A tumultuous crowd of vulgar, noisy people; a mob; a
      confused, disorderly throng.
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            I saw, I say, come out of London, even unto the
            presence of the prince, a great rabble of mean and
            light persons.                        --Ascham.
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            Jupiter, Mercury, Bacchus, Venus, Mars, and the
            whole rabble of licentious deities.   --Bp.
                                                  Warburton.
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   2. A confused, incoherent discourse; a medley of voices; a
      chatter.
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   The rabble, the lowest class of people, without reference
      to an assembly; the dregs of the people. "The rabble call
      him `lord.'" --Shak.
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