This is the 3511th most frequent Polish word.
środy
"Środy" means "Wednesdays" in English.
Here, 'środy' is in the singular genitive case, used to express recurring actions on each Wednesday.
W każdą środę chodzę na pływalnię.
I go to the swimming pool every Wednesday.
In this sentence, 'Środy' is in the plural nominative case, referring to all Wednesdays as a concept in general.
Środy są idealnym dniem na rozpoczęcie nowych planów.
Wednesdays are an ideal day to start new plans.
In this case, 'środy' is in the accusative plural form, used as the object of a negative verb to signify multiple occurrences.