This is the 1461st most frequent Polish word.
akademii
The Polish word "akademii" means "of the academy" (genitive singular form of "akademia").
In this sentence, 'akademii' is in the locative case to indicate the location where the studying is happening.
Uczę się w akademii sztuk pięknych.
I study at the academy of fine arts.
Here 'akademii' is in the genitive case to attribute possession or relation to the 'academy'.
To jest ulubiona książka profesora tej akademii.
This is the favorite book of the professor of this academy.
In this context, 'akademii' is used in the genitive case to indicate the source or origin of the souvenir.