S: (n) diagonal (diagonal%1:14:01::) ((mathematics) a set of entries in a square matrix running diagonally either from the upper left to lower right entry or running from the upper right to lower left entry)
S: (adj) diagonal (diagonal%3:00:02:oblique:00) (connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face) "a diagonal line across the page"