This is the 569th most frequent Finnish word.
eduskunnassa
"In the parliament."
The word 'eduskunnassa' is in the inessive case, indicating the place where the action occurs—'in the parliament'.
Eduskunnassa päätettiin uudesta laista.
In the parliament, a new law was decided upon.
Here, 'eduskunnassa' again uses the inessive case to describe the location of ongoing activities.
Keskustelu eduskunnassa jatkui myöhään yöhön.
The discussion in the parliament continued late into the night.
In this sentence, 'eduskunnassa' indicates the location where the discussion of the bill takes place, referring to the Finnish Parliament.