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.