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Meaning of diagonal

di•ag•o•nal

Pronunciation: (dī-ag'u-nl, -ag'nl), [key]
— adj.
    1. connecting two nonadjacent angles or vertices of a polygon or polyhedron, as a straight line.
    2. extending from one edge of a solid figure to an opposite edge, as a plane.
  1. having an oblique direction.
  2. having oblique lines, ridges, markings, etc.
—n.
  1. a diagonal line or plane.
  2. virgule.
  3. a diagonal row, part, pattern, etc.
  4. (of a horse at a trot) the foreleg and the hind leg, diagonally opposite, which move forward simultaneously.
  5. See
  6. a set of entries in a square matrix running either from upper left to lower rightor lower left to upper right
  7. one of the oblique lines of squares on a chessboard: He advanced his bishop along the open diagonal.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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