Situated in or lying towards the west or western part of something; on the westerly side.

Of, in, or directed towards that part or region of the sky in which the sun sets; of or in the west, western, westerly; (Astronomy and Astrology)…

spec. Applied to the sky or the horizon, esp. as the place of the sun's setting; also to the sun and other celestial objects, esp. the moon and…

Relating to the setting sun, western.