This is the 11527th most frequent Polish word.
kalendarz
"Calendar."
Here, 'kalendarz' still refers to the physical planner but is used in the context of it being utilized and written in.
Mój kalendarz jest pełen notatek.
My calendar is full of notes.
In this sentence, 'kalendarz' refers to a physical object, specifically a book or chart used to organize dates and plans.
Mam nowy kalendarz na przyszły rok.
I have a new calendar for the next year.
In this instance, 'kalendarz' is used as a reference tool to retrieve information about the schedule or dates.