Pronunciation: \ȯr-ˈthä-gə-nəl\
Function: adjective
Etymology: Middle French, from Latin orthogonius, from Greek orthogōnios, from orth- + gōnia angle — more at -gon
Date: 1612
1 a : intersecting or lying at right angles b : having perpendicular slopes or tangents at the point of intersection
2 : having a sum of products or an integral that is zero or sometimes one under specified conditions: as a of real-valued functions : having the integral of the product of each pair of functions over a specific interval equal to zero b of vectors : having the scalar product equal to zero c of a square matrix : having the sum of products of corresponding elements in any two rows or any two columns equal to one if the rows or columns are the same and equal to zero otherwise : having a transpose with which the product equals the identity matrix
3 of a linear transformation : having a matrix that is orthogonal : preserving length and distance
4 : composed of mutually orthogonal elements
5 : statistically independent
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