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diagonal

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di⋅ag⋅o⋅nal

[dahy-ag-uh-nl, -ag-nl]
–adjective
1. Mathematics.
a. connecting two nonadjacent angles or vertices of a polygon or polyhedron, as a straight line.
b. extending from one edge of a solid figure to an opposite edge, as a plane.
2. having an oblique direction.
3. having oblique lines, ridges, markings, etc.
–noun
4. a diagonal line or plane.
5. virgule.
6. a diagonal row, part, pattern, etc.
7. Manège. (of a horse at a trot) the foreleg and the hind leg, diagonally opposite, which move forward simultaneously.
8. diagonal cloth.
9. Mathematics. a set of entries in a square matrix running either from upper left to lower right (main diagonal or principal diagonal) or lower left to upper right (secondary diagonal).
10. Chess. one of the oblique lines of squares on a chessboard: He advanced his bishop along the open diagonal.

Origin:
1535–45; < L diagōnālis < Gk diagn(ios) from angle to angle (see dia-, -gon ) + L -ālis -al 1


di⋅ag⋅o⋅nal⋅ly, adverb
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diagonal cloth

–noun
a twilled fabric woven with distinctly diagonal lines.
Also called diagonal.


Origin:
1860–65

vir⋅gule

[vur-gyool]
–noun Printing.
1. a short oblique stroke (/) between two words indicating that whichever is appropriate may be chosen to complete the sense of the text in which they occur: The defendant and/or his/her attorney must appear in court.
2. a dividing line, as in dates, fractions, a run-in passage of poetry to show verse division, etc.: 3/21/27; 3/4; Sweetest love I do not go/For weariness of thee.
Also called diagonal, separatrix, shilling mark, slant, slash, solidus; especially British, stroke.


Origin:
1830–40; < F virgule comma, little rod < L virgula; see virgulate
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2010.
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di·ag·o·nal   (dī-āg'ə-nəl)   


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adj.  
  1. Mathematics

    1. Joining two nonadjacent vertices of a polygon.

    2. Joining two vertices of a polyhedron not in the same face.

  2. Having a slanted or oblique direction.

  3. Having oblique lines or markings.

  4. Relating to or being the front left and back right feet or the front right and back left feet of a quadruped.

n.  
  1. Mathematics A diagonal line or plane.

  2. Something, such as a row, course, or part, that is arranged obliquely.

  3. A fabric woven with diagonal lines.

  4. A virgule.


[Latin diagōnālis, from Greek diagōnios, from angle to angle : dia-, dia- + gōniā, angle, corner; see genu-1 in Indo-European roots.]
di·ag'o·nal·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

virgule 
thin sloping line, used as a comma in medieval MSS, 1837, from Fr. virgule, from L. virgula "punctuation mark," lit. "little twig," dim. of virga "shoot, rod, stick." The word had been borrowed in its L. form in 1728.

diagonal 
1541, from M.Fr. diagonal, from L. diagonalis, from diagonus "slanting line," from Gk. diagonios "from angle to angle," from dia- "across" + gonia "angle," related to gony "knee" (see knee).
Online Etymology Dictionary, © 2001 Douglas Harper
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Science Dictionary
diagonal   (dī-āg'ə-nəl)  Pronunciation Key 
Adjective   Connecting two nonadjacent corners in a polygon or two nonadjacent corners in a polyhedron that do not lie in the same face.

Noun   A diagonal line segment.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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