The Collaborative International Dictionary of English v.0.48:

Destiny \Des"ti*ny\, n.; pl. Destinies. [OE. destinee,
   destene, F. destin['e]e, from destiner. See Destine.]
   1. That to which any person or thing is destined;
      predetermined state; condition foreordained by the Divine
      or by human will; fate; lot; doom.
      [1913 Webster]

            Thither he
            Will come to know his destiny.        --Shak.
      [1913 Webster]

            No man of woman born,
            Coward or brave, can shun his destiny. --Bryant.
      [1913 Webster]

   2. The fixed order of things; invincible necessity; fate; a
      resistless power or agency conceived of as determining the
      future, whether in general or of an individual.
      [1913 Webster]

            But who can turn the stream of destiny? --Spenser.
      [1913 Webster]

            Fame comes only when deserved, and then is as
            inevitable as destiny, for it is destiny.
                                                  --Longfellow.
      [1913 Webster]

   The Destinies (Anc. Myth.), the three Parc[ae], or Fates;
      the supposed powers which preside over human life, and
      determine its circumstances and duration.
      [1913 Webster]

            Marked by the Destinies to be avoided. --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

destiny
    n 1: an event (or a course of events) that will inevitably
         happen in the future [syn: destiny, fate]
    2: the ultimate agency regarded as predetermining the course of
       events (often personified as a woman); "we are helpless in
       the face of destiny" [syn: destiny, fate]
    3: your overall circumstances or condition in life (including
       everything that happens to you); "whatever my fortune may
       be"; "deserved a better fate"; "has a happy lot"; "the luck
       of the Irish"; "a victim of circumstances"; "success that was
       her portion" [syn: fortune, destiny, fate, luck,
       lot, circumstances, portion]

Moby Thesaurus II by Grady Ward, 1.0:

184 Moby Thesaurus words for "destiny":
   Friday, Friday the thirteenth, Heaven, Paradise, Z, a better place,
   accidentality, actuarial calculation, adventitiousness, afterlife,
   afterworld, allotment, allowance, apodosis, appointed lot,
   astral influences, astrology, big end, bigger half, bit, bite,
   book of fate, break, budget, casualness, catastrophe, ceasing,
   cessation, chance, chunk, circumstance, coda, commission,
   conclusion, constellation, consummation, contingent, crack of doom,
   culmination, cup, curtain, curtains, cut, deal, death, decease,
   denouement, design, destination, dies funestis, dividend, dole,
   doom, effect, end, end point, ending, envoi, epilogue, equal share,
   eschatology, eternal home, expiration, fatality, fate,
   final solution, final twitch, final words, finale, finality, finis,
   finish, flukiness, foredoom, fortuitousness, fortuity, fortune,
   future, future state, gamble, goal, good fortune, good luck, half,
   halver, hap, happenstance, happy chance, heedless hap, helping,
   home, how they fall, ides of March, indeterminacy,
   indeterminateness, inevitability, intent, intention, interest,
   izzard, karma, kismet, last, last breath, last gasp, last things,
   last trumpet, last words, latter end, law of averages,
   life after death, life to come, lot, luck, measure, meed, mess,
   modicum, moiety, moira, next world, objective, omega, opportunity,
   otherworld, part, payoff, percentage, period, peroration, piece,
   planets, portion, postexistence, principle of indeterminacy,
   probability, problematicness, proportion, quantum, quietus, quota,
   rake-off, random sample, ration, resolution, resting place, risk,
   run of luck, segment, serendipity, share, slice, small share,
   stake, stars, statistical probability, stock, stoppage,
   stopping place, swan song, term, terminal, termination, terminus,
   the beyond, the breaks, the good hereafter, the grave,
   the great beyond, the great hereafter, the hereafter, the unknown,
   theory of probability, uncertainty, uncertainty principle,
   unlucky day, weird, what bodes, what is fated, whatever comes,
   wheel of fortune, will of Heaven, windup, world to come



The Devil's Dictionary (1881-1906):

DESTINY, n.  A tyrant's authority for crime and fool's excuse for
failure.