Prorogatio is a fancy Latin word that means when someone in charge decides to stop a group of people from meeting and talking anymore for a while.
Imagine you and your friends are playing a game and your grown-up tells you it's time to stop playing and go to bed. That's kind of like prorogatio.
In the grown-up world, sometimes an important group of people, like a government or parliament, meets to talk about important stuff like laws and rules. But sometimes the leader of that group decides they need a break from all the talking and they want everyone to stop meeting for a little while. This also has a fancy name called prorogation.
Prorogation means a break or pause from all the meetings to give everyone time to rest and think about what they want to talk about next. When the break is over, everyone can start meeting again and talking about important things.