This is the 214th most frequent Slovenian word.
prvem
"Prvem" means "first" (locative or instrumental case) in English.
The word 'prvem' is used as an ordinal adjective, describing the meeting ('srečanju') as the first.
Na prvem srečanju smo se spoznali.
At the first meeting, we got to know each other.
Here, 'prvem' is associated with the noun 'nadstropju' to specify which floor ('first').
Stanovanje se nahaja v prvem nadstropju.
The apartment is located on the first floor.
In this sentence, 'prvem' helps indicate which traffic light ('semaforju'), the first in order.