or·thog·o·nal (ôr-th g  -nl)adj. 1. Relating to or composed of right angles. 2. Mathematics a. Of or relating to a matrix whose transpose equals its inverse. b. Of or relating to a linear transformation that preserves the length of vectors. [From Greek orthog  nios : ortho-, ortho- + gni , angle; see genu-1 in Indo-European roots.]or·thog  o·nali·ty (-n l -t ) n.or·thog o·nal·ly adv. |
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