Main Entry:

¹di·ag·o·nal

Pronunciation:

\dī-ˈa-gə-n^əl, -ˈag-nəl\

Function:

adjective

Etymology:

Latin diagonalis, from Greek diagōnios from angle to angle, from dia- + gōnia angle; akin to Greek gony knee — more at knee

Date:

1563

1 a: joining two vertices of a rectilinear figure that are nonadjacent or two vertices of a polyhedral figure that are not in the same face b: passing through two nonadjacent edges of a polyhedron <a diagonal plane>2 a: inclined obliquely from a reference line (as the vertical) <wood with a diagonal grain> b: having diagonal markings or parts <a diagonal weave>