The Collaborative International Dictionary of English v.0.48:

Walk \Walk\ (w[add]k), v. i. [imp. & p. p. Walked; p. pr. &
   vb. n. Walking.] [OE. walken, probably from AS. wealcan to
   roll, turn, revolve, akin to D. walken to felt hats, to work
   a hat, G. walken to full, OHG. walchan to beat, to full,
   Icel. v[=a]lka to roll, to stamp, Sw. valka to full, to roll,
   Dan. valke to full; cf. Skr. valg to spring; but cf. also AS.
   weallian to roam, ramble, G. wallen. [root]130.]
   [1913 Webster]
   1. To move along on foot; to advance by steps; to go on at a
      moderate pace; specifically, of two-legged creatures, to
      proceed at a slower or faster rate, but without running,
      or lifting one foot entirely before the other touches the
      ground.
      [1913 Webster]

            At the end of twelve months, he walked in the palace
            of the kingdom of Babylon.            --Dan. iv. 29.
      [1913 Webster]

            When Peter was come down out of the ship, he walked
            on the water, to go to Jesus.         --Matt. xiv.
                                                  29.
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   Note: In the walk of quadrupeds, there are always two, and
         for a brief space there are three, feet on the ground
         at once, but never four.
         [1913 Webster]

   2. To move or go on the feet for exercise or amusement; to
      take one's exercise; to ramble.
      [1913 Webster]

   3. To be stirring; to be abroad; to go restlessly about; --
      said of things or persons expected to remain quiet, as a
      sleeping person, or the spirit of a dead person; to go
      about as a somnambulist or a specter.
      [1913 Webster]

            I have heard, but not believed, the spirits of the
            dead
            May walk again.                       --Shak.
      [1913 Webster]

            When was it she last walked?          --Shak.
      [1913 Webster]

   4. To be in motion; to act; to move; to wag. [Obs.] "Her
      tongue did walk in foul reproach." --Spenser.
      [1913 Webster]

            Do you think I'd walk in any plot?    --B. Jonson.
      [1913 Webster]

            I heard a pen walking in the chimney behind the
            cloth.                                --Latimer.
      [1913 Webster]

   5. To behave; to pursue a course of life; to conduct one's
      self.
      [1913 Webster]

            We walk perversely with God, and he will walk
            crookedly toward us.                  --Jer. Taylor.
      [1913 Webster]

   6. To move off; to depart. [Obs. or Colloq.]
      [1913 Webster]

            He will make their cows and garrans to walk.
                                                  --Spenser.
      [1913 Webster]

   To walk in, to go in; to enter, as into a house.

   To walk after the flesh (Script.), to indulge sensual
      appetites, and to live in sin. --Rom. viii. 1.

   To walk after the Spirit (Script.), to be guided by the
      counsels and influences of the Spirit, and by the word of
      God. --Rom. viii. 1.

   To walk by faith (Script.), to live in the firm belief of
      the gospel and its promises, and to rely on Christ for
      salvation. --2 Cor. v. 7.

   To walk in darkness (Script.), to live in ignorance, error,
      and sin. --1 John i. 6.

   To walk in the flesh (Script.), to live this natural life,
      which is subject to infirmities and calamities. --2 Cor.
      x. 3.

   To walk in the light (Script.), to live in the practice of
      religion, and to enjoy its consolations. --1 John i. 7.

   To walk over, in racing, to go over a course at a walk; --
      said of a horse when there is no other entry; hence,
      colloquially, to gain an easy victory in any contest.

   To walk through the fire (Script.), to be exercised with
      severe afflictions. --Isa. xliii. 2.

   To walk with God (Script.), to live in obedience to his
      commands, and have communion with him.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Walking \Walk"ing\,
   a. & n. from Walk, v.
   [1913 Webster]

   Walking beam. See Beam, 10.

   Walking crane, a kind of traveling crane. See under
      Crane.

   Walking fern. (Bot.) See Walking leaf, below.

   Walking fish (Zool.), any one of numerous species of
      Asiatic fishes of the genus Ophiocephalus, some of
      which, as Ophiocephalus marulius, become over four feet
      long. They have a special cavity over the gills lined with
      a membrane adapted to retain moisture to aid in
      respiration, and are thus able to travel considerable
      distances over the land at night, whence the name. They
      construct a curious nest for their young. Called also
      langya.

   Walking gentleman (Theater), an actor who usually fills
      subordinate parts which require a gentlemanly appearance
      but few words. [Cant]

   Walking lady (Theater), an actress who usually fills such
      parts as require only a ladylike appearance on the stage.
      [Cant]

   Walking leaf.
   (a) (Bot.) A little American fern (Camptosorus
       rhizophyllus); -- so called because the fronds taper
       into slender prolongations which often root at the apex,
       thus producing new plants.
   (b) (Zool.) A leaf insect. See under Leaf.

   Walking papers, or Walking ticket, an order to leave;
      dismissal, as from office; as, to get one's walking
      papers, i. e. to be dismissed or fired. [Colloq.]
      --Bartlett.

   Walking stick.
   (a) A stick or staff carried in the hand for hand for support
       or amusement when walking; a cane.
   (b) (Zool.) A stick insect; -- called also walking straw.
       See Illust. of Stick insect, under Stick.

   Walking wheel (Mach.), a prime mover consisting of a wheel
      driven by the weight of men or animals walking either in
      it or on it; a treadwheel.
      [1913 Webster]

WordNet (r) 3.0 (2006):

walking
    adj 1: close enough to be walked to; "walking distance"; "the
           factory with the big parking lot...is more convenient
           than the walk-to factory" [syn: walk-to(a),
           walking(a)]
    n 1: the act of traveling by foot; "walking is a healthy form of
         exercise" [syn: walk, walking]

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "walking":
   ambling, ambulant, ambulation, ambulative, ambulatory, backpacking,
   circuit-riding, expeditionary, footing, footing it, footwork,
   globe-girdling, globe-trotting, going, going on foot, hiking,
   hitchhiking, hitching, hoofing, itinerant, itinerary, journeying,
   legwork, locomotive, lumbering, marching, moving, mundivagant,
   on tour, passing, pedestrian, pedestrianism, perambulating,
   perambulation, perambulatory, peregrinative, peregrine,
   peripatetic, pilgrimlike, progressing, sauntering, staggering,
   strolling, thumbing, thumbing a ride, toddling, tottering, touring,
   touristic, touristy, tramping, traveling, treading, trekking,
   trudging, waddling, wayfaring