A parliamentary session is a period of time where the legislature in a parliamentary government is sitting. In Commonwealth Realms, each session begins with a speech from the throne and a pro forma bill to allow the Parliament to deviate from that speech. Sessions can thereafter last from a few weeks to over a year. Between two elections, there are usually anywhere from one to six sessions of parliament. Bills are numbered within each session and they expire if they don't become law by the time… (More on Prorogation)