diagonal
Noun

(geometry) a straight line connecting any two vertices of a polygon that are not adjacent (synset 113927331)
domain category: geometry  the pure mathematics of points and lines and curves and surfaceshypernym: straight line  a line traced by a point traveling in a constant direction; a line of zero curvature

A line or cut across a fabric that is not at right angles to a side of the fabric (synset 113927170)
hypernym: straight line  a line traced by a point traveling in a constant direction; a line of zero curvaturesynonym: bias

An oblique line of squares of the same color on a checkerboard (synset 108287338)
hypernym:hyponym:
 main diagonal, principal diagonal  the diagonal of a square matrix running from the upper left entry to the lower right entry
 secondary diagonal  the diagonal of a square matrix running from the lower left entry to the upper right entry
part meronym: checker board, checkerboard  a board having 64 squares of two alternating colors 
(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 (synset 108285242)
domain category: math, mathematics, maths  a science (or group of related sciences) dealing with the logic of quantity and shape and arrangementhypernym: set  (mathematics) an abstract collection of numbers or symbolspart meronym: square matrix  a matrix with the same number of rows and columns

A punctuation mark (/) used to separate related items of information (synset 106857953)
hypernym: punctuation, punctuation mark  the marks used to clarify meaning by indicating separation of words into sentences and clauses and phrases
Adjective

Connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face (synset 301724106)
similar: oblique  slanting or inclined in direction or course or positionneither parallel nor perpendicular nor rightangled

Having an oblique or slanted direction (synset 301237620)
similar: inclined  at an angle to the horizontal or vertical position
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