This is the 466th most frequent Finnish word.
laitoksen
"Laitoksen" is the possessive form of "laitos," meaning "of the institution" or "of the facility" in English.
The word 'laitoksen' here is the genitive case form of 'laitos', indicating possession or belonging, meaning 'institution's'.
Kävimme tänään laitoksen kirjastossa.
We visited the institution's library today.
In this sentence, 'laitoksen' describes possession or relatedness, referring to the rules belonging to the institution.
Laitoksen säännöt ovat tiukkoja.
The institution's rules are strict.
The word "laitoksen" here means "of the department," showing possession in the genitive case referring to a part of an institution (the department).