D defs.my
Entry 1 sense Webster, 1913

Diagonial

· Di·a·go·ni·al · IPA
01 a. Diagonal; diametrical; hence; diametrically opposed.
  1. 1.
    Diagonal; diametrical; hence; diametrically opposed.[Obs.]
    “Sin can have no tenure by law at all, but is rather an eternal outlaw, and in hostility with law past all atonement; both diagonal contraries, as much allowing one another as day and night together in one hemisphere.” Milton.