Mid 19th century; earliest use found in Augustus Pugin (1812–1852), architect, writer, and designer. Probably an alteration of westering after western.
Definition of westerning in US English:
westerning
adjective
Westering.
Origin
Mid 19th century; earliest use found in Augustus Pugin (1812–1852), architect, writer, and designer. Probably an alteration of westering after western.