Running neither vertical nor horizontal, like catty-corner

adjective

1. Joining two vertices of a rectilinear figure that are nonadjacent or two vertices of a polyhedral figure that are not in the same face
2. Passing through two nonadjacent edges of a polyhedron

   "a diagonal plane"

3. Inclined obliquely from a reference line (such as the vertical)

   "wood with a diagonal grain"

4. Having diagonal markings or parts

   "a diagonal weave"

noun

1. A diagonal straight line or plane
2. Something oriented in diagonal position
3. Slash

adverb

1. In a diagonal manner

noun

1. The act of slashing
2. An ornamental slit in a garment
3. An open tract in a forest strewn with debris (as from logging)
4. The debris in such a tract
5. A mark / used typically to denote "or" (as in and/or), "and or" (as in straggler/deserter), or "per" (as in feet/second)
6. A genre of fan fiction which features a romantic pairing of two usually male fictional characters who are not romantically connected in the original work of fiction

   "If women are the prime producers of the stuff, one would imagine that slash would be as full of male-female fantasies as male-male fantasies, but that's not the case."

noun

1. A low swampy area often overgrown with brush

noun

1. A diagonalized matrix

noun

1. The diagonal in a square matrix that runs from upper left to lower right

idiom

1. Corner to corner across the center diagonally

   "The stone wall cuts across the field on a diagonal."