Meaning of DIAGONAL in English

DIAGONAL

n.

Function: noun

Date: 1571

1 : a diagonal straight line or plane

2 a (1) : a diagonal direction (2) : a diagonal row, arrangement, or pattern b : something oriented in diagonal position

3 : SLASH 4

– on the diagonal : in an oblique direction : DIAGONALLY

Merriam Webster Collegiate English Dictionary.      Merriam Webster - Энциклопедический словарь английского языка.