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From The Collaborative International Dictionary of English v.0.48:
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 unavoidable. [1913 Webster] Sickness [might] necessitate his removal from the court. --South. [1913 Webster] This fact necessitates a second line. --J. Peile. [1913 Webster] 2. To reduce to the necessity of; to force; to compel. [1913 Webster] The Marquis of Newcastle, being pressed on both sides, was necessitated to draw all his army into York. --Clarendon. [1913 Webster]