- 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.
Origin of diagonal
Related formsdi·ag·o·nal·ly, adverbnon·di·ag·o·nal, adjective, nounnon·di·ag·o·nal·ly, adverb
Examples from the Web for diagonal
The young man weaves through clusters of bamboo and cuts a diagonal slash into a tree, positioning a hollow log at the end.
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.World Cup 2014 Nail-Biter: Host Country Brazil Defeats Chile on Penalty Kicks|Tunku Varadarajan|June 28, 2014|DAILY BEAST
Others were paired with sportswear-inspired tops—think a tracksuit zip-up made glam with diagonal decorative panels.Nicolas Ghesquière Presents His Debut Collection for Louis Vuitton|Liza Foreman|March 5, 2014|DAILY BEAST
I bought wine and I made a wine list and it was the first wine list of its kind: vertical, horizontal, and diagonal.
The ceiling is vaulted with diagonal and intermediate ribs, and has the appearance of having been added rather later.Bell's Cathedrals: The Churches of Coventry|Frederic W. Woodhouse
On the outer surface often arise radial spines, symmetrically disposed either in dimensive planes or in diagonal planes.
One raker, or diagonal strut, was rotted half through its thickness, and many other timbers were badly decayed.The Anatomy of Bridgework|William Henry Thorpe
Mouldings varying in size and kind, arranged on diagonal as well as rectangular planes, often ornamented with ball flower.Architecture|Thomas Roger Smith
Forces acting in the direction of lines forming an obtuse angle, will also produce motion in the diagonal of a parallelogram.Conversations on Natural Philosophy, in which the Elements of that Science are Familiarly Explained|Jane Haldimand Marcet and Thomas P. Jones