Each parliamentary year is known as a session.
The first session of every new Parliament begins with the election of a Speaker and the swearing in of new members.
At the start of every subsequent session, the first item of business is the royal address.
The length of a session is determined by the government but is controlled to some extent by convention and by the need to get legislation through Parliament on a yearly basis.
On average, there are four sessions to a parliament.
Most begin in October or November and last until the following October, although the House will take several breaks or recesses during the year.