Source : Webster's Revised Unabridged Dictionary (1913)

Compel \Com*pel"\, v. t. [imp. & p. p. {Compelled}; p. pr. & vb.
   n {Compelling}.] [L. compellere, compulsum, to drive
   together, to compel, urge; com- + pellere to drive: cf. OF.
   compellir. See {Pulse}.]
   1. To drive or urge with force, or irresistibly; to force; to
      constrain; to oblige; to necessitate, either by physical
      or moral force.

            Wolsey . . . compelled the people to pay up the
            whole subsidy at once.                --Hallam.

            And they compel one Simon . . . to bear his cross.
                                                  --Mark xv. 21.

   2. To take by force or violence; to seize; to exact; to
      extort. [R.]

            Commissions, which compel from each The sixth part
            of his substance.                     --Shak.

   3. To force to yield; to overpower; to subjugate.

            Easy sleep their weary limbs compelled. --Dryden.

            I compel all creatures to my will.    --Tennyson.

   4. To gather or unite in a crowd or company. [A Latinism]
      ``In one troop compelled.'' --Dryden.

   5. To call forth; to summon. [Obs.] --Chapman.

            She had this knight from far compelled. --Spenser.

   Syn: To force; constrain; oblige; necessitate; coerce. See
        {Coerce}.

Compel \Com*pel"\, v. i.
   To make one yield or submit. ``If she can not entreat, I can
   compel.'' --Shak.

Source : WordNet®

compel
     v 1: force or compel somebody to do something; "We compel all
          students to fill out this form" [syn: {oblige}, {obligate}]
     2: make someone do something [syn: {command}, {require}]
     [also: {compelling}, {compelled}]

Source : Free On-Line Dictionary of Computing

Compel
     
        {COMpute ParallEL}