orthogonal

adjectives

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"

statistically unrelated

orthogonal

is similar to

lacking a logical or causal relation

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"

orthogonal, rectangular

is derived from