diagonal

adj. having an oblique direction

n. oblique line

A diagonal can refer to a line joining two nonadjacent vertices of a polygon or polyhedron, or in contexts any upward or downward sloping line. The word "diagonal" was originally from the Greek διαγωνιος (diagonios), used by both Strabo and Euclid to refer to a line connecting two vertices of a rhombus or cuboid, and is formed from dia- ("through", "across") and gonia ("angle", related to gony "knee."), later adopted into Latin as diagonus ("slanting line").
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Noun
1. (geometry) a straight line connecting any two vertices of a polygon that are not adjacent
(hypernym) straight line
(classification) geometry
2. a line or cut across a fabric that is not at right angles to a side of the fabric
(synonym) bias
(hypernym) straight line
3. an oblique line of squares of the same color on a checkerboard; "the bishop moves on the diagonals"
(hypernym) line
(hyponym) main diagonal, principal diagonal
(part-holonym) checkerboard
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
(hypernym) set
(part-holonym) square matrix
(derivation) diagonalize, diagonalise
(classification) mathematics, math, maths
5. a punctuation mark (/) used to separate related items of information
(synonym) solidus, slash, virgule, stroke, separatrix
(hypernym) punctuation, punctuation mark
Adjective
1. at an angle; especially 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) oblique
2. having an oblique or slanted direction
(synonym) aslant, aslope, slanted, slanting, sloped, sloping
(similar) inclined

adv. diagonally, obliquely

adj. diagonal, having an oblique direction

adj. diagonal, having an oblique direction