Meaning of DIAGONAL in English

DIAGONAL

adj. & n.

adj. 1 crossing a straight-sided figure from corner to corner. 2 slanting, oblique.

n. a straight line joining two non-adjacent corners. diagonally adv.

[ L diagonalis f. Gk diagonios (as DIA-, gonia angle) ]

Concise Oxford English dictionary.      Краткий оксфордский словарь английского языка.