This is the 5806th most frequent Polish word.
zakupem
"Zakupem" means "purchase" or "acquisition" in English.
Here, 'zakupu' is in the genitive case, referring to possession.
Jestem zadowolony z mojego zakupu nowego komputera.
I am satisfied with my purchase of a new computer.
Here, 'zakupowi' is in the dative case, indicating purpose or reason.
Dzięki zakupowi mieszkania mogłem wreszcie się wprowadzić.
Thanks to the purchase of the apartment, I was finally able to move in.
Here, 'zakupem' is in the instrumental case, describing a relation or association.