This is the 14213th most frequent Polish word.
proboszcza
"Proboszcza" means "parish priest" in English.
The word 'proboszcza' refers to the parish priest and is used here in the context of having a conversation, in its instrumental form (proboszczem).
Wczoraj rozmawiałem z proboszczem naszej parafii.
Yesterday, I spoke with the parish priest of our parish.
Here, 'proboszcz' is the nominative case, indicating the subject of the sentence who is organizing the fair.
Proboszcz naszej wsi zorganizował festyn dla mieszkańców.
The parish priest of our village organized a fair for the residents.
In this sentence, 'proboszcza' is in the genitive case, showing possession or relation within the context of the sermon.