This is the 4629th most frequent Polish word.
misji
"Misji" translates to "mission" in English.
Here 'misji' (mission) is in a locative case, referring to a specific purpose-driven operation.
Jutro wyruszamy na misję ratunkową.
Tomorrow we embark on a rescue mission.
In this sentence, 'misji' (mission) is in the genitive case, indicating possession or association.
Celem naszej misji jest ochrona środowiska.
The goal of our mission is environmental protection.
The word 'misji' here is also in the dative case, specifying an intent or objective.