This is the 11934th most frequent Polish word.
kupieniem
The word "kupieniem" is the instrumental singular form of "kupienie," meaning "the act of buying" or "purchase" in English.
The noun 'kupieniem' is used here to denote the means of acquiring an item, framed by the preposition 'o' suggesting contemplation or consideration.
Pomyślałem o kupieniem nowej książki.
I thought about buying a new book.
Here, the noun 'kupieniem' indicates the action of purchase that has already occurred, with the preposition 'z' expressing contentment with the result.
Cieszę się z kupieniem tego samochodu.
I am happy with buying this car.
In this sentence, 'kupieniem' is used to describe the difficulty associated with the action of buying, framed by 'z' to indicate the issue's aspect.