# diagonal

[dahy-ag-uh-nl, -ag-nl] /daɪˈæg ə nl, -ˈæg nl/
1.
Mathematics.
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.
2.
having an oblique direction.
3.
having oblique lines, ridges, markings, etc.
noun
4.
a diagonal line or plane.
5.
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.
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 of diagonal
1535-1545
1535-45; < Latin diagōnālis < Greek diagṓn(ios) from angle to angle (see dia-, -gon) + Latin -ālis -al1
Related forms
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for diagonal
Contemporary Examples
• The young man weaves through clusters of bamboo and cuts a diagonal slash into a tree, positioning a hollow log at the end.

December 17, 2014
• I bought wine and I made a wine list and it was the first wine list of its kind: vertical, horizontal, and diagonal.

February 22, 2010
• Others were paired with sportswear-inspired tops—think a tracksuit zip-up made glam with diagonal decorative panels.

• A long, diagonal cross from Marcelo saw the ball reach Hulk, who brought it down to his feet from the top of his monumental chest.

• Long strips of thin, white paper, about four feet wide, were spread in diagonal lines all over the hall.

February 25, 2009
Historical Examples
• The ladies take close order with their backs to the door, towards which they retreat in a diagonal line.

Hermann Pckler-Muskau
• The sand gully opened towards the sea in a diagonal direction.

Mayne Reid
• Smaller lenses than this cannot well be used because they would not cover the diagonal of lantern slides.

Henry C. Horstmann
• A door to the left, set in a diagonal wall, gives on to a corridor.

Eugne Brieux
• By this time I had gotten to 2,200, the boche was almost up to me and taking a diagonal course right in front.

James R. McConnell
British Dictionary definitions for diagonal

## diagonal

/daɪˈæɡənəl/
1.
(maths) connecting any two vertices that in a polygon are not adjacent and in a polyhedron are not in the same face
2.
slanting; oblique
3.
marked with slanting lines or patterns
noun
4.
(maths) a diagonal line or plane
5.
(chess) any oblique row of squares of the same colour
6.
cloth marked or woven with slanting lines or patterns
7.
something put, set, or drawn obliquely
8.
another name for solidus (sense 1)
9.
one front leg and the hind leg on the opposite side of a horse, which are on the ground together when the horse is trotting
Derived Forms
Word Origin
C16: from Latin diagōnālis, from Greek diagōnios, from dia- + gōnia angle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for diagonal

1540s (implied in diagonally), from Middle French diagonal, from Latin diagonalis, from diagonus "slanting line," from Greek diagonios "from angle to angle," from dia- "across" (see dia-) + gonia "angle," related to gony "knee" (see knee (n.)). As a noun, from 1570s.

Online Etymology Dictionary, © 2010 Douglas Harper
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diagonal in Science
 diagonal   (dī-āg'ə-nəl)    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
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### Difficulty index for diagonal

Most English speakers likely know this word

### Word Value for diagonal

10
13
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