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.
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.
00:10
Diagonally is always a great word to know.
So is flibbertigibbet. Does it mean:
the offspring of a zebra and a donkey.
a chattering or flighty, light-headed person.

Origin:
1535–45; < Latin diagōnālis < Greek diagṓn(ios) from angle to angle (see dia-, -gon) + Latin -ālis -al1

di·ag·o·nal·ly, adverb
non·di·ag·o·nal, adjective, noun
non·di·ag·o·nal·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To diagonally
Collins
World English Dictionary
diagonal (daɪˈæɡənəl) [Click for IPA pronunciation guide]
 
adj
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
 
n
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
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
 
[C16: from Latin diagōnālis, from Greek diagōnios, from dia- + gōnia angle]
 
di'agonally
 
adv

diagonal (daɪˈæɡənəl) [Click for IPA pronunciation guide]
 
adj
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
 
n
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
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
 
[C16: from Latin diagōnālis, from Greek diagōnios, from dia- + gōnia angle]
 
di'agonally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

diagonal
1540s, 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). Related: Diagonally.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
American Heritage
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.
Cite This Source
Example sentences
Compression straps tighten the load, while skis are carried diagonally or a
  board vertically with horizontally option.
My trick was to scroll the gecko diagonally, spin him, and then switch diagonal
  directions.
Moving diagonally doesn't count as another degree of freedom because it's a
  combination of the first three.
Waves come ashore diagonally, as their backwash flows perpendicular to the
  beach.
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