(adj) having a set of mutually perpendicular axes; meeting at right angles, Syn. rectangular, Example:wind and sea may displace the ship's center of gravity along three orthogonal axes; a rectangular Cartesian coordinate system
(adj) not pertinent to the matter under consideration, Syn. orthogonal, immaterial, impertinent, Example:an issue extraneous to the debate; the price was immaterial; mentioned several impertinent facts before finally coming to the point