What does 'mark' means in the following sentence?<br/><br/>The new parliamentary session is marked by the <a href="http://www.EnglishForward.com/wiki/State_Opening_of_Parliament">State Opening of Parliament</a>, during which either the monarch, the governor general, or a royal delegate,<sup><font color="#0066cc"> </font></sup>reads the <a href="http://www.EnglishForward.com/wiki/Speech_from_the_Throne">Speech from the Throne</a>.<br/><br/>Thanks so much.