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Adjective: orthogonal  or'thó-gu-nul
  1. Not pertinent to the matter under consideration
    "an issue orthogonal to the debate";
    - extraneous, immaterial, impertinent
     
  2. Statistically unrelated
     
  3. Having a set of mutually perpendicular axes; meeting at right angles
    "wind and sea may displace the ship's centre of gravity along three orthogonal axes";
    - rectangular

See also: beside the point, irrelevant, perpendicular, unrelated

Encyclopedia: Orthogonal