kalendarzu
Kalendarzu is the locative singular form of the Polish noun kalendarz, meaning calendar. In Polish, kalendarz is a masculine inanimate noun, and its locative singular ends with -u, producing kalendarzu. This form is used after prepositions such as w (in), o (about), or na (on/about) to indicate location or topic. For example: "W kalendarzu szkolnym znajdują się ważne terminy" or "O kalendarzu przyszłorocznym rozmawialiśmy."
Kalendarz, the base word, refers to a system for organizing days into weeks and months, as well
Etymology and cognates: kalendarz derives from Latin calendarium, meaning a register of days, and reached Polish
Usage notes: kalendarzu is primarily encountered in written and formal speech where the locative case is required