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.
      [1913 Webster]

            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]

Moby Thesaurus II by Grady Ward, 1.0:

135 Moby Thesaurus words for "amble":
   airing, barge, bowl along, bundle, canter, caracole, claudicate,
   clump, constitutional, crawl, creep, curvet, dally, dillydally,
   dogtrot, drag, drag along, drag out, drift, droop, flounce, foot,
   footslog, forced march, frisk, gait, gallop, go dead slow,
   go on horseback, go slow, hack, halt, hike, hippety-hop, hitch,
   hobble, hop, idle, inch, inch along, jaunt, jog, jog-trot, jolt,
   jump, laze, limp, linger, lock step, loiter, lope, lumber, lunge,
   lurch, march, mince, mincing steps, mope, mosey, mount, muck, mush,
   pace, paddle, parade, peg, peripatetic journey, peripateticism,
   piaffe, piaffer, plod, poke, poke along, prance, promenade, rack,
   ramble, ride bareback, ride hard, roll, sashay, saunter, schlep,
   scuff, scuffle, scuttle, shamble, shuffle, shuffle along, sidle,
   single-foot, skip, slink, slither, slog, slouch, slowness, stagger,
   stagger along, stalk, stamp, step, stomp, straddle, straggle,
   stretch, stride, stroll, strolling gait, strut, stump, swagger,
   swing, take horse, tittup, toddle, toddle along, totter,
   totter along, traipse, tramp, tread, trip, trot, trudge, turn,
   velocity, waddle, walk, walking tour, wamble, wiggle, wobble, worm,
   worm along