This is the 11405th most frequent Polish word.
instytutem
"Instytutem" means "institute" in the instrumental case in Polish.
Here, 'instytutem' is instrumental singular, indicating the object involved in the action.
Byłem w instytutem nauki języków obcych.
I was at the institute of foreign language studies.
'Instytutem' here is used in instrumental singular to specify association.
Rozmawiałem z dyrektorem związanym z tym instytutem.
I talked to the director associated with this institute.
In this context, 'instytutem' acts as the object of collaboration, using instrumental singular.