bisection [bisections](a division into two parts, especially into two equal parts) noun [UK: baɪ.ˈsek.ʃn̩] [US: baɪ.ˈsek.ʃn̩]
bisector [bisectors](A line or curve that bisects or divides a line segment, angle, or other figure into two equal parts) noun [UK: baɪ.ˈsek.tə] [US: baɪ.ˈsek.tər]