This is the 10783rd most frequent Polish word.
dymisji
"Resignation" or "dismissal" (from a position).
In this sentence, 'dymisji' is in the genitive case being used to indicate the act of resignation of the President.
Prezydent kraju ogłosił swoją decyzję o dymisji.
The country's President announced his decision to resign.
Here 'dymisji' is used to describe the resignation that the protesters are calling for.
Protestujący domagali się dymisji ministra.
The protesters demanded the minister's resignation.
In this case, 'dymisji' indicates the resignations suggested as necessary according to the report.