The Collaborative International Dictionary of English v.0.48:

Voluble \Vol"u*ble\, a. [L. volubilis, fr. volvere, volutum, to
   roll, to turn round; akin to Gr. ? to infold, to inwrap, ? to
   roll, G. welle a wave: cf. F. voluble. Cf. F. Well of
   water, Convolvulus, Devolve, Involve, Revolt, Vault
   an arch, Volume, Volute.]
   [1913 Webster]
   1. Easily rolling or turning; easily set in motion; apt to
      roll; rotating; as, voluble particles of matter.
      [1913 Webster]

   2. Moving with ease and smoothness in uttering words; of
      rapid speech; nimble in speaking; glib; as, a flippant,
      voluble, tongue.
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            [Cassio,] a knave very voluble.       --Shak.
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   Note: Voluble was used formerly to indicate readiness of
         speech merely, without any derogatory suggestion. "A
         grave and voluble eloquence." --Bp. Hacket.
         [1913 Webster]

   3. Changeable; unstable; fickle. [Obs.]
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   4. (Bot.) Having the power or habit of turning or twining;
      as, the voluble stem of hop plants.
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   Voluble stem (Bot.), a stem that climbs by winding, or
      twining, round another body.
      [1913 Webster] -- Vol"u*ble*ness, n. -- Vol"u*bly,
      adv.
      [1913 Webster]

WordNet (r) 3.0 (2006):

volubly
    adv 1: in a chatty manner; "`when I was a girl,' she said
           chattily, `I used to ride a bicycle'" [syn: chattily,
           volubly]