Source : Webster's Revised Unabridged Dictionary (1913)

Bifurcation \Bi`fur*ca"tion\, n. [Cf. F. bifurcation.]
   A forking, or division into two branches.

Source : WordNet®

bifurcation
     n 1: a bifurcating branch (one or both of them)
     2: the place where something divides into two branches
     3: the act of splitting into two branches