The relation of opposition between things at right angles.

synonyms: orthogonal opposition, orthogonality.

Roget 212: verticality; erectness etc. adj.; perpendicularity etc. 216.1; right angle, normal; azimuth circle.    wall, precipice, cliff.    elevation, erection; square, plumb line, plummet.    ... show more

Roget 216a: perpendicularity, orthogonality; verticality, etc. 212.   

The quality of being at right angles to a given line or plane (especially the plane of the horizon).

Polish: prostopadłość