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orthogonal
/ɔːˈθɒɡənəl/
noun
An orthogonal line
adjective
Of two objects, at right angles; perpendicular to each other.
"A chord and the radius that bisects it are orthogonal."
Of a pair of vectors: having a zero inner product; perpendicular.
"The normal vector and tangent vector at a given point are orthogonal."
Of a square matrix: such that its transpose is equal to its inverse.
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