orthogonal

Adj.	1.	orthogonal - not pertinent to the matter under consideration; "an issue extraneous to the debate"; "the price was immaterial"; "mentioned several impertinent facts before finally coming to the point" extraneous, impertinent, immaterial irrelevant - having no bearing on or connection with the subject at issue; "an irrelevant comment"; "irrelevant allegations"
	2.	orthogonal - statistically unrelated unrelated - not connected or associated
	3.	orthogonal - having a set of mutually perpendicular axes; meeting at right angles; "wind and sea may displace the ship's center of gravity along three orthogonal axes"; "a rectangular Cartesian coordinate system" rectangular perpendicular - intersecting at or forming right angles; "the axes are perpendicular to each other"

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