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# 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. 2018.
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Examples from the Web for diagonally
Historical Examples
• The thong was cut across, diagonally, almost as clean as though done by a knife.

Jack London
• But he hurried on, diagonally, across the big cavern-like hall.

• She swung us diagonally away from both the camp and the brigand ship.

• We caught the fellow as he was diagonally crossing the street.

Raymond King Cummings
• These branched off diagonally or at right angles, and were more or less deep and steep.

Mayne Reid
• The bays must then be diagonally measured as already explained.

H. Barber
• Across his chest, diagonally, was a garland of the same flowers.

Carolyn Wells
• One of them can extend across (diagonally) from post to post.

Charles Gardner Wheeler
• The wand was so long that it went into her suitcase only by laying it in diagonally.

Annie Fellows Johnston
• The men were sitting just to the left of the doorway, diagonally across from him.

Ralph Henry Barbour
British Dictionary definitions for diagonally

## 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 diagonally

## 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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diagonally 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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### Word Value for diagonally

15
18
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