This is the 7277th most frequent Polish word.
język
"Język" means "language" or "tongue" in English.
In this context, 'język' is metaphorically used to refer to a 'language' or system of expression, such as artistic expression.
Język sztuki potrafi wyrazić to, co słowa nie mogą.
The language of art can express what words cannot.
In this sentence, 'język' refers to a 'language', specifically English, as a medium of communication.
Mówię płynnie w języku angielskim.
I speak English fluently.
Here, 'język' is used to mean 'tongue', the organ in the mouth involved in speaking and tasting.