- 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.
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Origin of diagonal
OTHER WORDS FROM diagonaldi·ag·o·nal·ly, adverbnon·di·ag·o·nal, adjective, nounnon·di·ag·o·nal·ly, adverb
Example sentences from the Web for diagonal
Place these Nine in a Square of three, they will directly and diagonally make 18.The History of the Devil|Daniel Defoe
On the opposite corner, diagonally, have an imitation stump with hatchet sticking in the wood.Dinners and Luncheons|Paul Pierce
The red letters of "Votes for Women" ran around her diagonally like the stripes of a barber-pole.Affinities and Other Stories|Mary Roberts Rinehard
Diagonally across it, many yards away, ran one of the stone fences of the region, a long dike of loosely piled and rounded rock.The Long Roll|Mary Johnston
Diagonally across from your house, in the corner house; in my window, in a cage, is a canary.Delusion and Dream|Wilhelm Jensen