1. (noun) diagonal
(geometry) a straight line connecting any two vertices of a polygon that are not adjacent
Synonyms: slash, solidus, bias, stroke, virgule, separatrix
Antonyms: perpendicular, parallel, vertical, horizontal
2. (noun) diagonal, bias
a line or cut across a fabric that is not at right angles to a side of the fabric
Synonyms: prejudice, virgule, solidus, separatrix, diagonal, bias, slash, stroke, preconception
Antonyms: horizontal, vertical, perpendicular, parallel
3. (noun) diagonal
an oblique line of squares of the same color on a checkerboard
Synonyms: slash, solidus, bias, stroke, virgule, separatrix
Antonyms: perpendicular, horizontal, vertical, parallel
4. (noun) diagonal
(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
Synonyms: slash, solidus, bias, stroke, virgule, separatrix
Antonyms: parallel, perpendicular, horizontal, vertical
5. (adj) solidus, slash, virgule, diagonal, stroke, separatrix
a punctuation mark (/) used to separate related items of information
Synonyms: cam stroke, gash, throw, stroking, stroke, bezant, accident, fortuity, bezzant, slash, cut, bias, solidus, virgule, diagonal, chance event, apoplexy, cerebrovascular accident, byzant, separatrix, slice, shot
Antonyms: perpendicular, vertical, parallel, horizontal
6. (adj) diagonal
connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face
Synonyms: aslant, aslope, sloped, sloping, slanted, slanting
Antonyms: horizontal, parallel, vertical, perpendicular
7. (adj) aslant, aslope, diagonal, slanted, slanting, sloped, sloping
having an oblique or slanted direction
Synonyms: slanted, biased, aslant, aslope, one-sided, sloping, coloured, slanting, diagonal, sloped, colored
Antonyms: perpendicular, horizontal, parallel, vertical
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Synonyms and Antonyms of diagonal 
