# diagonal

[dahy-ag-uh-nl, -ag-nl]

- Mathematics.
- connecting two nonadjacent angles or vertices of a polygon or polyhedron, as a straight line.
- extending from one edge of a solid figure to an opposite edge, as a plane.

- having an oblique direction.
- having oblique lines, ridges, markings, etc.

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- a diagonal line or plane.
- virgule.
- a diagonal row, part, pattern, etc.
- Manège. (of a horse at a trot) the foreleg and the hind leg, diagonally opposite, which move forward simultaneously.
- diagonal cloth.
- 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).
- Chess. one of the oblique lines of squares on a chessboard: He advanced his bishop along the open diagonal.

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## Origin of diagonal

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Related Words for diagonally

crosswise, askew, obliquely, aslant, catty-corner, cornerwise, kitty-corner, slantways, slantwise## Examples from the Web for diagonally

### Historical Examples of diagonally

The thong was cut across, diagonally, almost as clean as though done by a knife.

White FangJack London

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

Nostromo: A Tale of the SeaboardJoseph Conrad

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

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

The White InvadersRaymond King Cummings

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

The War TrailMayne Reid

## diagonal

- maths connecting any two vertices that in a polygon are not adjacent and in a polyhedron are not in the same face
- slanting; oblique
- marked with slanting lines or patterns

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- maths a diagonal line or plane
- chess any oblique row of squares of the same colour
- cloth marked or woven with slanting lines or patterns
- something put, set, or drawn obliquely
- another name for solidus (def. 1)
- 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

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## Word Origin for diagonal

C16: from Latin diagōnālis, from Greek diagōnios, from dia- + gōnia angle

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## Word Origin and History for diagonally

## diagonal

Online Etymology Dictionary, © 2010 Douglas Harper

## diagonal

[dī-ăg′ə-nəl]

- Connecting two nonadjacent corners in a polygon or two nonadjacent corners in a polyhedron that do not lie in the same face.

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- A diagonal line segment.

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The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.