1. the division of something into three equal parts
Usage: mathematics; geometry

Examples

• The trisection of an angle is a classic problem in geometry.
• Ancient mathematicians attempted the trisection of arbitrary angles using only compass and straightedge.
• The trisection of the circle created three equal arcs.
• Students learned that angle trisection cannot be accomplished with classical construction methods.
• The trisection problem remained unsolved for centuries until proven impossible.
• Each trisection point divided the line segment into three congruent parts.