Definition: necessitate

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Source: WordNet (r) 1.7 

necessitate
     v 1: require as useful, just, or proper; "It takes nerve to do
          what she did"; "success usually requires hard work";
          "This job asks a lot of patience and skill"; "This
          position demands a lot of personal sacrifice"; "This
          dinner calls for a spectacular dessert" [syn: ask, need,
           require, take, involve, call for, demand]
          [ant: obviate]
     2: cause to be a concomitant

Source: Webster's Revised Unabridged Dictionary (1913) 

Necessitate \Ne*ces"si*tate\, v. t. [imp. & p. p.
   Necessitated; p. pr. & vb. n. Necessitating.] [Cf. L.
   necessitatus, p. p. of necessitare, and F. n['e]cessiter. See
   Necessity.]
   1. To make necessary or indispensable; to render unaviolable.

            Sickness [might] necessitate his removal from the
            court.                                --South.

            This fact necessitates a second line. --J. Peile.

   2. To reduce to the necessity of; to force; to compel.

            The Marquis of Newcastle, being pressed on both
            sides, was necessitated to draw all his army into
            York.                                 --Clarendon.