Source : Webster's Revised Unabridged Dictionary (1913)

Spent \Spent\ (sp[e^]nt), a.
   1. Exhausted; worn out; having lost energy or motive force.

            Now thou seest me Spent, overpowered, despairing of
            success.                              --Addison.

            Heaps of spent arrows fall and strew the ground.
                                                  --Dryden.

   2. (Zo["o]l.) Exhausted of spawn or sperm; -- said especially
      of fishes.

   {Spent ball}, a ball shot from a firearm, which reaches an
      object without having sufficient force to penetrate it.

Spend \Spend\, v. t. [imp. & p. p. {Spent}; p. pr. & vb. n.
   {Spending}.] [AS. spendan (in comp.), fr. L. expendere or
   dispendere to weigh out, to expend, dispense. See {Pendant},
   and cf. {Dispend}, {Expend}, {Spence}, {Spencer}.]
   1. To weigh or lay out; to dispose of; to part with; as, to
      spend money for clothing.

            Spend thou that in the town.          --Shak.

            Wherefore do ye spend money for that which is not
            bread?                                --Isa. lv. 2.

Source : WordNet®

spent
     adj 1: drained of energy or effectiveness; extremely tired;
            completely exhausted; "the day's shopping left her
            exhausted"; "he went to bed dog-tired"; "was fagged
            and sweaty"; "the trembling of his played out limbs";
            "felt completely washed-out"; "only worn-out horses
            and cattle"; "you look worn out" [syn: {exhausted}, {dog-tired},
             {fagged}, {fatigued}, {played out}, {washed-out}, {worn-out(a)},
             {worn out(p)}]
     2: having all been spent; "the money is all gone" [syn: {gone},
         {expended}]

spend
     v 1: pass (time) in a specific way; "How are you spending your
          summer vacation?" [syn: {pass}]
     2: pay out; "spend money" [syn: {expend}, {drop}]
     3: spend completely; "I spend my pocket money in two days"
     [also: {spent}]

spent
     See {spend}