noun
a linear transformation that preserves the dot product of vectors
adjective
relating to or involving right angles; perpendicular
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In mathematics, two vectors are orthogonal if their dot product is zero.
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The two lines are orthogonal to each other, meaning they intersect at right angles.
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I don't get why they're making us learn about orthogonal matrices in class.
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His views on politics are completely orthogonal to mine, we never seem to agree on anything.