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

  • adj. Mathematics Joining two nonadjacent vertices of a polygon.
  • adj. Mathematics Joining two vertices of a polyhedron not in the same face.
  • adj. Having a slanted or oblique direction.
  • adj. Having oblique lines or markings.
  • adj. Relating to or being the front left and back right feet or the front right and back left feet of a quadruped.
  • n. Mathematics A diagonal line or plane.
  • n. Something, such as a row, course, or part, that is arranged obliquely.
  • n. A fabric woven with diagonal lines.
  • n. A virgule.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Joining two nonadjacent vertices (of a polygon or polyhedron).
  • adj. Having a slanted or oblique direction, lines or markings.
  • adj. Pertaining to the front left and back right (or the front right and back left) legs of a quadruped.
  • n. something arranged diagonally or obliquely
  • n. a line or cut across a fabric that is not at right angles to a side of the fabric
  • n. a punctuation mark used to separate related items of information
  • n. a diagonal line or plane
  • n. a line joining non-adjacent vertices of a polygon.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Joining two not adjacent angles of a quadrilateral or multilateral figure; running across from corner to corner; crossing at an angle with one of the sides.
  • n. A right line drawn from one angle to another not adjacent, of a figure of four or more sides, and dividing it into two parts.
  • n. A member, in a framed structure, running obliquely across a panel.
  • n. A diagonal cloth; a kind of cloth having diagonal stripes, ridges, or welts made in the weaving.

from The Century Dictionary and Cyclopedia

  • In geometry, extending, as a line, from one angle to another not adjacent, within any figure.
  • Being in an oblique direction; lying obliquely.
  • Marked by oblique lines: as, diagonal cloth.
  • .
  • A soft material used as a ground for embroidery, generally made very wide, and dyed in plain colors without pattern.
  • A material for men's wear, especially for coats and waistcoats.
  • n. A straight line drawn from one angle to or through another, not adjacent, in any plane or solid figure.
  • n. Any oblique line.
  • n. Specifically
  • n. In chess, checkers, etc., a line of squares running diagonally across the board. See chess.
  • n. Same as diagonal cloth, especially in the United States: a term introduced about 1875.

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

  • n. (mathematics) a set of entries in a square matrix running diagonally either from the upper left to lower right entry or running from the upper right to lower left entry
  • n. an oblique line of squares of the same color on a checkerboard
  • n. a punctuation mark (/) used to separate related items of information
  • adj. having an oblique or slanted direction
  • n. (geometry) a straight line connecting any two vertices of a polygon that are not adjacent
  • adj. connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face
  • n. a line or cut across a fabric that is not at right angles to a side of the fabric


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

Latin diagōnālis, from Greek diagōnios, from angle to angle : dia-, dia- + gōniā, angle, corner.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin diagōnālis, from Ancient Greek διαγώνιος (diagonios, "from angle to angle"), from διά (dia, "across") + γωνία (gonia, "angle").


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