ETYM Latin diagonalis, from Greek, to angle; dia through + gonon an angle; perh. akin to Eng. knee: cf. French diagonal.
At an angle; especially connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face.

ETYM Latin transversus, p. p. of transvertere to turn on direct across; trans across + vertere to turn: cf. French transverse. Related to Verse, Traverse.
Lying or being across, or in a crosswise direction.

ETYM Latin diagonalis, from Greek, to angle; dia through + gonon an angle; perh. akin to Eng. knee: cf. French diagonal.
At an angle; especially connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face.

In a diagonal manner.