(noun, adjective)


1. 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

Similar word(s): oblique

2. having an oblique or slanted direction

Similar word(s): inclined, aslant, aslope, slanted, slanting, sloped, sloping


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

Definition categories: shape

2. a line or cut across a fabric that is not at right angles to a side of the fabric

Similar word(s): bias

Definition categories: shape

3. an oblique line of squares of the same color on a checkerboard

- the bishop moves on the diagonals

Definition categories: group, line

4. (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

Definition categories: group, set

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

Similar word(s): separatrix, slash, solidus, stroke, virgule

Definition categories: communication, punctuation