Sentence:  [W]e could define a national parliament broadly as a Member State's central representative assembly which elects or at least dismisses the national government, and which holds it to account. This seems to be a robust definition comprising the <WSD>unicameral</WSD> parliaments, the lower chambers of the bicameral parliaments and the senates with censure powers in the EU Member States. 
Meaning of the word marked with <WSD> tags:  Of, or having, a single legislative chamber.