Adjective
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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"
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statistically unrelated
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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"