from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Relating to or composed of right angles.
  • adj. Mathematics Of or relating to a matrix whose transpose equals its inverse.
  • adj. Mathematics Of or relating to a linear transformation that preserves the length of vectors.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Of two objects, at right angles; perpendicular to each other.
  • adj. Statistically independent, with reference to variates.
  • adj. Of two or more aspects of a problem, able to be treated separately.
  • adj. Of two or more problems or subjects, independent of or irrelevant to each other.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Right-angled; rectangular.

from The Century Dictionary and Cyclopedia

  • Pertaining to or depending upon the use of right angles.
  • Right-angled.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. statistically unrelated
  • adj. having a set of mutually perpendicular axes; meeting at right angles
  • adj. not pertinent to the matter under consideration


From Greek orthogōnios : ortho-, ortho- + gōniā, angle.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Medieval Latin orthogonalis, from Latin orthogonius ("right-angled"). (Wiktionary)



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