n. [ Cf. F. trisection. ] The division of a thing into three parts, Specifically: (Geom.) the division of an angle into three equal parts. [ 1913 Webster ]
n. [ L. resectio: cf. F. résection. ] 1. The act of cutting or paring off. Cotgrave. [ 1913 Webster ]
2. (Surg.) The removal of the articular extremity of a bone, or of the ends of the bones in a false articulation. [ 1913 Webster ]