diagonal /daɪ̯ˈæɡ(ə)nəl/adjective 4noun 5forms 1 adjective4 •Having slanted or oblique lines or markings. •Having a slanted or oblique direction.The visitors' undoing was caused by a diagonal ball from the right which was nodded into the six-yard area by Ian Evatt and finished off by Campbell. — 2011 •Joining two nonadjacent vertices (of a polygon or polyhedron). •Of or related to the cater-corner (diagonally opposite) legs of a quadruped, whether the front left and back right or front right and back left. noun5 •A line joining non-adjacent vertices of a polygon. •Anything forming or resembling such a line •A line or plane at an oblique angle to another. •A line or cut across a fabric at an oblique angle to its sides. •Synonym of slash ⟨/⟩. formsdiagonals
