n.
Pronunciation: d ī - ' a-g ə -n ə l, - ' ag-n ə l
Function: adjective
Etymology: Latin diagonalis, from Greek diag ō nios from angle to angle, from dia- + g ō nia 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>