This is the 3845th most frequent Polish word.
piotrkowie
"Piotrkowie" does not have a standalone meaning in Polish; it may refer to a form of the name "Piotrków," a Polish city name, in a specific grammatical case.
In this sentence, 'Piotrkowie' is used as the locative case of 'Piotrków,' referring to being located in the place named Piotrków.
Mieszkam w Piotrkowie od pięciu lat.
I have lived in Piotrkow for five years.
Here, 'Piotrkowie' is again the locative case of 'Piotrków,' used to indicate the subject of the conversation being related to Piotrków.
Rozmawialiśmy o Piotrkowie podczas wczorajszej lekcji.
We talked about Piotrkow during yesterday's lesson.
Once more, 'Piotrkowie' is in the locative case, indicating the place where the action of staying will occur.