Source : Webster's Revised Unabridged Dictionary (1913)

Lust \Lust\, n. [AS. lust, lust, pleasure, longing; akin to OS.,
   D., G., & Sw. lust, Dan. & Icel. lyst, Goth lustus, and perh.
   tom Skr. lush to desire, or to E. loose. Cf. {List} to
   please, {Listless}.]
   1. Pleasure. [Obs.] `` Lust and jollity.'' --Chaucer.

   2. Inclination; desire. [Obs.]

            For little lust had she to talk of aught. --Spenser.

            My lust to devotion is little.        --Bp. Hall.

   3. Longing desire; eagerness to possess or enjoy; -- in a had
      sense; as, the lust of gain.

            The lust of reigning. --Milton.

   4. Licentious craving; sexual appetite. --Milton.

   5. Hence: Virility; vigor; active power. [Obs.] --Bacon.

Lust \Lust\, v. i. [imp. & p. p. {Lusted}; p. pr. & vb. n.
   {Lusting}.] [AS. lystan. See {Lust}, n., and cf. List to
   choose.]
   1. To list; to like. [Obs.] --Chaucer. `` Do so if thou lust.
      '' --Latimer.

   Note: In earlier usage lust was impersonal.

               In the water vessel he it cast When that him
               luste.                             --Chaucer.

   2. To have an eager, passionate, and especially an inordinate
      or sinful desire, as for the gratification of the sexual
      appetite or of covetousness; -- often with after.

            Whatsoever thy soul lusteth after.    --Deut. xii.
                                                  15.

            Whosoever looketh on a woman to lust after her, hath
            committed adultery with her already in his heart.
                                                  --Matt. v. 28.

            The spirit that dwelleth in us lusteth to envy.
                                                  --James iv. 5.

Source : WordNet®

lust
     n 1: a strong sexual desire [syn: {lecherousness}, {lustfulness}]
     2: self-indulgent sexual desire (personified as one of the
        deadly sins) [syn: {luxuria}]

lust
     v : have a craving, appetite, or great desire for [syn: {crave},
          {hunger}, {thirst}, {starve}]