No. 2,545 in Polish
pierwszego
"Pierwszego" means "of the first" or "on the first" (e.g., referring to the first day of the month).
In a sentence
Kupiłem bilet na pociąg pierwszego dnia miesiąca.
I bought a train ticket on the first day of the month.
Here, 'pierwszego' is used as the masculine singular genitive case modifier for 'first' in the context of specifying a date.
Spotkaliśmy się na przystanku pierwszego lutego.
We met at the bus stop on the first of February.
This usage shows 'pierwszego' in the genitive case, indicating the ordinal time reference for the date.
On był pierwszego chłopaka mojego brata.
He was my brother's first male friend.
In this sentence, 'pierwszego' modifies 'chłopaka' in the masculine singular genitive case.
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