This is the 14842nd most frequent Polish word.
regularnych
"Regularnych" means "regular" or "consistent" (plural, genitive).
Here, "regularnych" functions as an adjective in the genitive plural form, modifying the noun "ćwiczeń," emphasizing its quality of regularity.
W czasie wojny prowadzono regularnych ćwiczeń wojskowych.
During the war, regular military exercises were conducted.
In this example, "regularnych" is used as an adjective in the locative plural form, describing the meetings "spotkaniach," indicating their recurring nature.
Książka opowiada o regularnych spotkaniach klubu czytelniczego.
The book tells about the regular meetings of the reading club.
"Regularnych" here modifies "badań" and is in the genitive plural form, illustrating the systematic or routine aspect of the check-ups.