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.

Source : WordNet®

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"; "This
          intervention does not postulates a patient's consent"
          [syn: {ask}, {postulate}, {need}, {require}, {take}, {involve},
           {call for}, {demand}] [ant: {obviate}]
     2: cause to be a concomitant