diagonal in WordNet English dictionary

1. having an oblique or slanted direction
   aslant  aslope  diagonal  slanted  slanting  sloped  sloping 
   
2. 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"
   diagonal 
   

1. a line or cut across a fabric that is not at right angles to a side of the fabric
   diagonal  bias 
   
2. a punctuation mark (/) used to separate related items of information
   solidus  slash  virgule  diagonal  stroke  separatrix 
   
3. an oblique line of squares of the same color on a checkerboard
   "the bishop moves on the diagonals"
   diagonal 
   
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
   diagonal 
   
5. (geometry) a straight line connecting any two vertices of a polygon that are not adjacent
   diagonal