This is the 10037th most frequent Polish word.
basenem
"Basenem" means "swimming pool" (in the instrumental case) in Polish.
Here, 'basenem' (instrumental case of 'basen') indicates a location near the pool.
Idziemy na spacer z psem wzdłuż parku z basenem.
We are going for a walk with the dog along the park with a pool.
'Basenem' is used to specify the proximity to the swimming pool in this situation.
Cieszę się, że udało nam się spotkać przy basenem.
I'm glad we managed to meet by the swimming pool.
'Basenem' refers to the physical location below the swimming pool.