Parliamentary republic
A parliamentary republic is a republic that operates under a parliamentary system of government where the executive branch (called the government in such systems) derives its legitimacy from and is accountable to the legislature (the parliament). Both executive and legislative powers are ultimately held within the parliament (fusion of powers) as most commonly the government is a subset of the members of the parliament (as opposed to congressional systems, where the congress - the legislature - is part of the government in the wider sense of the word).