• a punctuation mark (/) used to separate related items of information
• (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
• an oblique line of squares of the same color on a checkerboard; "the bishop moves on the Diagonals"
• a line or cut across a fabric that is not at right angles to a side of the fabric
• (geometry) a straight line connecting any two vertices of a polygon that are not adjacent
• having an oblique or slanted direction
• at an angle; especially 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"

'Diagonal' in other languages