This is the 16676th most frequent Polish word.
współlokatora
Roommate.
In this sentence, 'współlokatora' is used in the singular accusative case, referring to a male roommate encountered by the speaker.
Wczoraj spotkałem współlokatora na uczelni.
Yesterday, I met my roommate at the university.
Here, 'współlokatora' is used in the singular accusative case, denoting a male roommate belonging to the person being addressed.
Czy mogę poznać twojego współlokatora?
Can I meet your roommate?
In this context, 'współlokatora' again appears in the singular accusative case, and it describes the individual (male) being welcomed to a shared living arrangement.