Definition of: bisect

(bī·sekt′) v.t.
1. To cut into two parts; halve.
2. Geom. To divide into two parts of equal size.
—v.i.
3. To fork, as a road. [<BI- + L sectus, pp. of secare cut]
—bi·sec′tion noun
—bi·sec′tion·al adjective
—bi·sec′tion·al·ly adverb