1. Having an oblique or slanted direction
   "The roof was diagonal, allowing rainwater to run off easily";
   - aslant, aslope, 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"

1. (geometry) a straight line connecting any two vertices of a polygon that are not adjacent
   "The diagonal of a square forms two equal right triangles"
    
2. A line or cut across a fabric that is not at right angles to a side of the fabric
   "The dress was cut on the diagonal for a more flattering fit";
   - bias
    
3. An oblique line of squares of the same colour on a checkerboard
   "the bishop moves on the diagonals"
    
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
   "The sum of the elements along the main diagonal is called the trace of the matrix"
    
5. A punctuation mark ('/') used to separate related items of information
   "The date was written with diagonals (dd/mm/yyyy)";
   - solidus [Brit, Cdn], slash, virgule, stroke, separatrix, oblique [Brit]

Derived forms: diagonals

See also: inclined, oblique

Type of: line, punctuation, punctuation mark [Brit], set, straight line

Part of: checker board [N. Amer], checkerboard [N. Amer], chequerboard [Brit, Cdn], draughtboard [Brit], square matrix

Encyclopedia: Diagonal, Iowa