Definition of "diagonal" []

• Mathematics Joining two nonadjacent vertices of a polygon. (adjective)
• Mathematics Joining two vertices of a polyhedron not in the same face. (adjective)
• Having a slanted or oblique direction. (adjective)
• Having oblique lines or markings. (adjective)
• Relating to or being the front left and back right feet or the front right and back left feet of a quadruped. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "No. 419: that the _red diagonal_ members represent the _saltire gules_ of St. Patrick, No. 421, and that the _narrow diagonal white_ lines are added in order to place this _saltire gules on a field argent_: that the"
• "A square blanket, twelve feet in diagonal, is provided, (some were wont to cut off the corners, and make it circular;) in the centre a slit is effected, eighteen inches long; through this the mother-naked trooper introduces his head and neck, and so rides shielded from all weather, and in battle from many strokes (for he rolls it about his left arm); and not only dressed, but harnessed and draperied."
• "First of all u must understant that the roads of Bucharest are already full of cars that make around 1.30 hours for a simple trip from a part of Bucharest in diagonal … At least!"