This is the 2510th most frequent Polish word.
lublina
"Lublina" is not a standalone word in Polish; it may refer to "Lublina" as a form of the name "Lublin," a city in Poland, depending on grammatical context.
Here, 'Lublinie' is the locative case of 'Lublin' and it indicates the location where the speaker lives.
Mieszkam w Lublinie od kilku lat.
I have been living in Lublin for a few years.
In this sentence, 'Lublina' is the genitive case of 'Lublin', showing possession or origin.
Podarowałem książkę przyjacielowi z Lublina.
I gave a book to a friend from Lublin.
The word 'Lublina' here is also in the genitive case, indicating the vicinity related to the city.