The Collaborative International Dictionary of English v.0.48:

Amble \Am"ble\, n.
   1. A peculiar gait of a horse, in which both legs on the same
      side are moved at the same time, alternating with the legs
      on the other side. "A fine easy amble." --B. Jonson.
      [1913 Webster]

   2. A movement like the amble of a horse.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Amble \Am"ble\, v. i. [imp. & p. p. Ambled; p. pr. & vb. n.
   Ambling.] [F. ambler to amble, fr. L. ambulare to walk, in
   LL., to amble, perh. fr. amb-, ambi-, and a root meaning to
   go: cf. Gr. ? to go, E. base. Cf. Ambulate.]
   1. To go at the easy gait called an amble; -- applied to the
      horse or to its rider.
      [1913 Webster]

   2. To move somewhat like an ambling horse; to go easily or
      without hard shocks.
      [1913 Webster]

            The skipping king, he ambled up and down. --Shak.
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            Sir, your wit ambles well; it goes easily. --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

amble
    n 1: a leisurely walk (usually in some public place) [syn:
         amble, promenade, saunter, stroll, perambulation]
    v 1: walk leisurely [syn: amble, mosey]