No. 1,340 in Polish
pierwszą
"Pierwszą" means "the first" (feminine, accusative or instrumental case).
In a sentence
Zosia była pierwszą osobą, która do mnie przyszła.
Zosia was the first person who came to me.
The word 'pierwszą' here is used as an ordinal adjective, agreeing in gender, case, and number with the noun 'osobą'.
Kupiłem pierwszą książkę z tej serii.
I bought the first book from this series.
The word 'pierwszą' is an ordinal adjective describing the noun 'książkę', in accusative singular form matching its direct object role in the sentence.
W moim życiu spotkałem moją pierwszą miłość.
In my life, I encountered my first love.
Here, 'pierwszą' modifies the noun 'miłość', functioning as an ordinal adjective in the instrumental case, agreeing with the verb it relates to.
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