Etymology
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orthogonal (adj.)

"pertaining to or depending upon the use of right angles," 1570s, from French orthogonal, from orthogone, from Late Latin orthogonius, from Greek orthogonios "right-angled," from ortho- "straight" (see ortho-) + gōnia "angle, corner" (from PIE root *genu- (1) "knee; angle"). Related: Orthogonally; orthogonality.

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Definitions of orthogonal

orthogonal (adj.)
not pertinent to the matter under consideration;
orthogonal (adj.)
statistically unrelated;
orthogonal (adj.)
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
Synonyms: rectangular
From wordnet.princeton.edu