出典:Wiktionary
From Anglo-Norman prorogation, Middle French prorogation, and their source, Latin prōrogātiō (“extension, postponement”).
prorogation (countable かつ uncountable, 複数形 prorogations)
When a legislature or parliament is prorogued, it is still constituted (that is, all members remain as members かつ a general election is not necessary), but all orders of the body (bills, motions, etc.) are expunged.