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