Sentence:  There were extraordinary scenes of chaos and anger in the House of Commons overnight as opposition MPs staged a protest against the suspension of parliament for five weeks – a <WSD>prorogation</WSD> that the Speaker of the House said represented “an act of executive fiat”. 
Meaning of the word marked with <WSD> tags:  The action of proroguing an assembly, especially a parliament; discontinuance of meetings for a given period of time, without dissolution. (from 15th c.)