Source : Webster's Revised Unabridged Dictionary (1913)

Bisect \Bi*sect"\, v. t. [imp. & p. p. {Bisected}; p. pr. & vb.
   n. {Bisecting}.] [L. bis twice + secare, sectum, to cut.]
   1. To cut or divide into two parts.

   2. (Geom.) To divide into two equal parts.

Source : WordNet®

bisect
     v : cut in half or cut in two; "bisect a line"