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Dictionary definition for: Diagonal

1. (n) (geometry) a straight line connecting any two vertices of a polygon that are not adjacent

2. (s) 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"

3. (n) a line or cut across a fabric that is not at right angles to a side of the fabric

4. (s) having an oblique or slanted direction

5. (n) an oblique line of squares of the same color on a checkerboard; "the bishop moves on the diagonals"

6. (n) (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

7. (n) a punctuation mark (/) used to separate related items of information

WordNet 2.1 Copyright Princeton University. All rights reserved.