Source : Webster's Revised Unabridged Dictionary (1913)

Lucky \Luck"y\, a. [Compar. {Luckier}; superl. {Luckiest}.]
   1. Favored by luck; fortunate; meeting with good success or
      good fortune; -- said of persons; as, a lucky adventurer.
      `` Lucky wight.'' --Spenser.

   2. Producing, or resulting in, good by chance, or
      unexpectedly; favorable; auspicious; fortunate; as, a
      lucky mistake; a lucky cast; a lucky hour.

            We doubt not of a fair and lucky war. --Shak.

   Syn: Successful; fortunate; prosperous; auspicious.

Source : WordNet®

lucky
     adj 1: blessed with good fortune; "considered himself lucky that
            the tornado missed his house"; "a lucky guess"
     2: having or bringing good fortune; "my lucky day" [ant: {unlucky}]
     3: tending to favor or bring good luck; "miracles are
        auspicious accidents"; "encouraging omens"; "a favorable
        time to ask for a raise"; "lucky stars"; "a prosperous
        moment to make a decision" [syn: {auspicious}, {encouraging},
         {favorable}, {favourable}, {prosperous}]
     [also: {luckiest}, {luckier}]

luckier
     See {lucky}