This is the 9944th most frequent Polish word.
aresztowania
"Arrest" or "apprehension."
Here, 'aresztowania' is used as a noun in the plural form to indicate the act of apprehending individuals.
Policja ogłosiła aresztowania dwóch podejrzanych.
The police announced the arrests of two suspects.
In this sentence, 'aresztowań' is in the genitive plural form, describing the reason for people's concern.
Ludzie byli zaniepokojeni z powodu masowych aresztowań w mieście.
People were concerned due to mass arrests in the city.
Here, 'aresztowania' is in the singular genitive form, indicating possession or association with the individual being arrested.