The Collaborative International Dictionary of English v.0.48:

Alight \A*light"\, v. i. [imp. & p. p. Alightedsometimes
   Alit; p. pr. & vb. n. Alighting.] [OE. alihten, fr. AS.
   [=a]l[imac]htan; pref. [=a]- (cf. Goth. us-, G. er-, orig.
   meaning out) + l[imac]htan, to alight, orig. to render light,
   to remove a burden from, fr. l[imac]ht, leoht, light. See
   Light, v. i.]
   1. To spring down, get down, or descend, as from on horseback
      or from a carriage; to dismount.
      [1913 Webster]

   2. To descend and settle, lodge, rest, or stop; as, a flying
      bird alights on a tree; snow alights on a roof.
      [1913 Webster]

   3. To come or chance (upon). [R.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Alight \A*light"\, a. [Pref. a- + light.]
   Lighted; lighted up; in a flame. "The lamps were alight."
   --Dickens.
   [1913 Webster]

WordNet (r) 3.0 (2006):

alight
    adj 1: lighted up by or as by fire or flame; "forests set ablaze
           (or afire) by lightning"; "even the car's tires were
           aflame"; "a night aflare with fireworks"; "candles alight
           on the tables"; "houses on fire" [syn: ablaze(p),
           afire(p), aflame(p), aflare(p), alight(p), on
           fire(p)]
    v 1: to come to rest, settle; "Misfortune lighted upon him"
         [syn: alight, light, perch]
    2: come down; "the birds alighted" [syn: alight, climb down]

Moby Thesaurus II by Grady Ward, 1.0:

115 Moby Thesaurus words for "alight":
   ablaze, afire, aflame, aflicker, aglow, ardent, bathed with light,
   bespangled, blazing, bright, brightened, burning, candent,
   candescent, candlelit, climb down, comburent, come down, come in,
   come to land, conflagrant, crash-land, debark, debus, deplane,
   descend, detrain, disembark, disemplane, dismount, ditch, dock,
   downwind, drop, drop anchor, effulgent, enlightened, fall, fiery,
   firelit, flagrant, flaming, flaring, flickering, fulgent, fuming,
   gaslit, get down, get off, glowing, go ashore, guttering,
   ignescent, ignited, illuminated, in a blaze, in a glow, in flames,
   incandescent, inflamed, irradiate, irradiated, kindled, lamplit,
   land, lanternlit, level off, light, lighted, lightened, lit,
   lit up, live, living, luminous, make a landfall, make land,
   make port, moonlit, moor, on fire, overshoot, pancake, perch,
   put in, put into port, reach land, reeking, refulgent, roost,
   scintillant, scintillating, set down, settle, settle down,
   sit down, smoking, smoldering, spangled, sparking, star-spangled,
   star-studded, starlit, studded, sunlit, talk down, tie up,
   tinseled, touch down, tumble, unboat, unextinguished, unhorse,
   unquenched, upwind