This refers to the building where the library is located, as opposed to the basic idea or concept of a library which is called paq nojwI' tum (lit. "library agency").
Cite this entry
Definition of {paq nojwI' qach}
from the Klingon Language Wiki:
https://klingon.wiki/Word/PakNojwI-Kach
Retrieved 03 Feb 2023