Definitions from Wiktionary (Diagonal)

▸ adjective:  (geometry) Joining two nonadjacent vertices (of a polygon or polyhedron).
▸ adjective:  Having slanted or oblique lines or markings.
▸ adjective:  Having a slanted or oblique direction.
▸ adjective:  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.
▸ noun:  (geometry) A line joining non-adjacent vertices of a polygon.
▸ noun:  Anything forming or resembling such a line, particularly:
▸ noun:  (geometry) A line or plane at an oblique angle to another.
▸ noun:  (fashion) A line or cut across a fabric at an oblique angle to its sides.
▸ noun:  (typography, uncommon) Synonym of slash ⟨/⟩.
▸ noun:  A city and town in Iowa.
▸ Also see diagonal

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