This is the 11855th most frequent Russian word.
западная
"Западная" means "western" in English.
Here, 'западная' describes a geographical region, Europe, specifying its western part.
Западная Европа имеет богатую историю.
Western Europe has a rich history.
In this sentence, 'западная' refers to the direction relative to the building, indicating the side that faces west.
Западная сторона здания была освещена солнцем.
The western side of the building was lit by the sun.
The usage here highlights sociocultural characteristics, contrasting 'western' with other cultural contexts.