Source : Webster's Revised Unabridged Dictionary (1913)

Dispel \Dis*pel"\, v. t. [imp. & p. p. {Dispelled}; p. pr. & vb.
   n. {Dispelling}.] [L. dispellere; dis- + pellere to push,
   drive. See {Pulse} a beating.]
   To drive away by scattering, or so to cause to vanish; to
   clear away; to banish; to dissipate; as, to dispel a cloud,
   vapors, cares, doubts, illusions.

         [Satan] gently raised their fainting courage, and
         dispelled their fears.                   --Milton.

         I saw myself the lambent easy light Gild the brown
         horror, and dispel the night.            --Dryden.

Source : WordNet®

dispel
     v 1: force to go away; used both with concrete and metaphoric
          meanings; "Drive away potential burglars"; "drive away
          bad thoughts"; "dispel doubts"; "The supermarket had to
          turn back many disappointed customers" [syn: {chase away},
           {drive out}, {turn back}, {drive away}, {drive off}, {run
          off}]
     2: to cause to separate and go in different directions; "She
        waved her hand and scattered the crowds" [syn: {disperse},
         {dissipate}, {break up}, {scatter}]
     [also: {dispelling}, {dispelled}]

dispelling
     See {dispel}