adjective
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(geometry) Of two objects, at right angles; perpendicular to each other.
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Of a pair of vectors: having a zero inner product; perpendicular.
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Of a square matrix: such that its transpose is equal to its inverse.
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Of a linear transformation: preserving its angles.
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Of grid graphs, board games and polyominoes: vertical or horizontal but not diagonal.
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Of a pair of elements in an ortholattice: each less than or equal to the orthocomplement of the other.
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(statistics) Statistically independent, with reference to variates.
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(software engineering) Of two or more aspects of a problem, able to be treated separately; of a design, exhibiting consistency and composability.
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Of two or more problems or subjects, independent of or irrelevant to each other.