(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

(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

a punctuation mark (‘/’) used to separate related items of information