This is the 1339th most frequent German word.
westlichen
"Westlichen" means "western" in English.
The word "westlichen" is used here as an adjective describing "Länder" (countries), indicating their position as situated in the western part of the world.
Die westlichen Länder sind bekannt für ihre fortschrittliche Technologie.
The western countries are known for their advanced technology.
In this sentence, "westlichen" functions as an adjective modifying "Teil" (part), to specify its location relative to the city.
Ich mag den westlichen Teil der Stadt wegen seiner schönen Architektur.
I like the western part of the city because of its beautiful architecture.
Here, "westlichen" describes "Winde" (winds), indicating their origin or direction coming from the west.