This is the 3832nd most frequent Polish word.
parlamentu
"Parlamentu" means "of the parliament" in English.
In this sentence, 'parlamentu' is a genitive case of 'parlament', used to indicate possession or connection to deliberations.
Obrady parlamentu rozpoczęły się wczoraj.
The parliament's deliberations started yesterday.
'Parlamentu' is again in the genitive case, here describing affiliation or membership within the parliament.
Nowy członek parlamentu został dziś wybrany.
A new member of the parliament was elected today.
Here, 'parlamentu' is used in the genitive case to show the source or approval entity defined as the parliament.