[f. prec. + -ITY.] The quality or fact of being collinear.
Line of collinearity (of a triangle): the pedal line with respect to a point in the circumference of the circumscribed circle.
1863. R. Townsend, Mod. Geom., I. 176. Criteria of collinearity and concurrence of the several points and lines.
1881. Casey, Sequel to Euclid, 36. The line of collinearity of the feet of the perpendiculars from P on the sides of the triangle.
