noun. the relation of opposition between things at right angles.
noun. the quality of being at right angles to a given line or plane (especially the plane of the horizon).
Example sentences of the word perpendicularity
1. Noun, singular or mass
The cross product of two vectors yields a third vector that points in the direction perpendicular to the plane spanned by the two vectors, and whose magnitude depends on the relative perpendicularity of the two vectors.