1. A figure having three angles; a triangle.
2. (Science: astronomy) A division consisting of three signs. Trine, an aspect of two planets distant 120 degrees from each other.
3. A kind of triangular lyre or harp. A kind of game at ball played by three persons standing at the angular points of a triangle.
Origin: L. Trigonum, Gr.; (see Tri-) – a corner, angle: cf. F. Trigone.