The Collaborative International Dictionary of English v.0.48:

Behoove \Be*hoove"\, v. t. [imp. & p. p. Behooved; p. pr. &
   vb. n. Behooving.] [OE. bihoven, behoven, AS. beh?fian to
   have need of, fr. beh?f. See Behoof.]
   To be necessary for; to be fit for; to be meet for, with
   respect to necessity, duty, or convenience; -- mostly used
   impersonally.
   [1913 Webster]

         And thus it behooved Christ to suffer.   --Luke xxiv.
                                                  46.
   [1913 Webster] [Also written behove.]
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The Collaborative International Dictionary of English v.0.48:

Behoove \Be*hoove"\, v. i.
   To be necessary, fit, or suitable; to befit; to belong as
   due. --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Behoove \Be*hoove"\, n.
   Advantage; behoof. [Obs.]
   [1913 Webster]

         It shall not be to his behoove.          --Gower.
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WordNet (r) 3.0 (2006):

behoove
    v 1: be appropriate or necessary; "It behooves us to reflect on
         this matter" [syn: behoove, behove]