Meaning of diagonal

Definition of diagonal

(adj) 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"
having an oblique or slanted direction
(noun) (geometry) a straight line connecting any two vertices of a polygon that are not adjacent
a line or cut across a fabric that is not at right angles to a side of the fabric
an oblique line of squares of the same color on a checkerboard; "the bishop moves on the diagonals"
(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

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