The Collaborative International Dictionary of English v.0.48:

Discharge \Dis*charge"\, v. t. [imp. & p. p. Discharged; p.
   pr. & vb. n. Discharging.] [OE. deschargen, dischargen, OF.
   deschargier, F. d['e]charger; pref. des- (L. dis) + chargier,
   F. charger. See Charge.]
   1. To relieve of a charge, load, or burden; to empty of a
      load or cargo; to unburden; to unload; as, to discharge a
      vessel.
      [1913 Webster]

   2. To free of the missile with which anything is charged or
      loaded; to let go the charge of; as, to discharge a bow,
      catapult, etc.; especially, said of firearms, -- to fire
      off; to shoot off; also, to relieve from a state of
      tension, as a Leyden jar.
      [1913 Webster]

            The galleys also did oftentimes, out of their prows,
            discharge their great pieces against the city.
                                                  --Knolles.
      [1913 Webster]

            Feeling in other cases discharges itself in indirect
            muscular actions.                     --H. Spencer.
      [1913 Webster]

   3. To of something weighing upon or impeding over one, as a
      debt, claim, obligation, responsibility, accusation, etc.;
      to absolve; to acquit; to clear.
      [1913 Webster]

            Discharged of business, void of strife. --Dryden.
      [1913 Webster]

            In one man's fault discharge another man of his
            duty.                                 --L'Estrange.
      [1913 Webster]

   4. To relieve of an office or employment; to send away from
      service; to dismiss.
      [1913 Webster]

            Discharge the common sort
            With pay and thanks.                  --Shak.
      [1913 Webster]

            Grindal . . . was discharged the government of his
            see.                                  --Milton.
      [1913 Webster]

   5. To release legally from confinement; to set at liberty;
      as, to discharge a prisoner.
      [1913 Webster]

   6. To put forth, or remove, as a charge or burden; to take
      out, as that with which anything is loaded or filled; as,
      to discharge a cargo.
      [1913 Webster]

   7. To let fly, as a missile; to shoot.
      [1913 Webster]

            They do discharge their shot of courtesy. --Shak.
      [1913 Webster]

   8. To set aside; to annul; to dismiss.
      [1913 Webster]

            We say such an order was "discharged on appeal."
                                                  --Mozley & W.
      [1913 Webster]

            The order for Daly's attendance was discharged.
                                                  --Macaulay.
      [1913 Webster]

   9. To throw off the obligation of, as a duty or debt; to
      relieve one's self of, by fulfilling conditions,
      performing duty, trust, and the like; hence, to perform or
      execute, as an office, or part.
      [1913 Webster]

            Had I a hundred tongues, a wit so large
            As could their hundred offices discharge. --Dryden.
      [1913 Webster]

   10. To send away (a creditor) satisfied by payment; to pay
       one's debt or obligation to. [Obs.]
       [1913 Webster]

             If he had
             The present money to discharge the Jew. --Shak.
       [1913 Webster]

   11. To give forth; to emit or send out; as, a pipe discharges
       water; to let fly; to give expression to; to utter; as,
       to discharge a horrible oath.
       [1913 Webster]

   12. To prohibit; to forbid. [Scot. Obs.] --Sir W. Scott.
       [1913 Webster]

   13. (Textile Dyeing & Printing) To bleach out or to remove or
       efface, as by a chemical process; as, to discharge the
       color from a dyed fabric in order to form light figures
       on a dark ground.
       [Webster 1913 Suppl.]

   Discharging arch (Arch.), an arch over a door, window, or
      other opening, to distribute the pressure of the wall
      above. See Illust. of Lintel.

   Discharging piece, Discharging strut (Arch.), a piece set
      to carry thrust or weight to a solid point of support.

   Discharging rod (Elec.), a bent wire, with knobs at both
      ends, and insulated by a glass handle. It is employed for
      discharging a Leyden jar or an electrical battery. See
      Discharger.

   Syn: See Deliver.
        [1913 Webster]

WordNet (r) 3.0 (2006):

discharged
    adj 1: having lost your job [syn: discharged, dismissed,
           fired, laid-off, pink-slipped]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "discharged":
   accomplished, achieved, acquitted, attained, compassed,
   consummated, dispatched, disposed of, effected, effectuated,
   executed, expended, fulfilled, hired, implemented, liquidated,
   paid, paid in full, postpaid, prepaid, realized, receipted,
   remitted, salaried, set at rest, settled, spent, waged, wrought,
   wrought out



Bouvier's Law Dictionary, Revised 6th Ed (1856):

DISCHARGED. Released, or liberated from custody. It is not equivalent to
acquitted in a declaration for a malicious prosecution. 2 Yeates, 475 2 Term
Rep. 231; 1 Strange, 114; Doug. 205 3 Leon. 100.