Register your class for the 2012 WordGirl Definition Competition, which takes place via live webcast. The site explains:
The Definition Competition will consist of three short rounds plus a bonus round. In a game-show setting, students will put their vocabulary skills in practice as they are asked questions pertaining to word usage, definitions, using words in different contexts and reading comprehension. Your class will play along, in real-time, by submitting answers online during the webcast—and may be called out during the event! Plus, by registering for the Definition Competition, your class and school will automatically be entered into the WordGirl Definition Competition Sweepstakes for a chance to win books and WordGirl prizes!
The competition is May 1, but register now to receive a kit to help your class practice. Here are the official rules. Good luck!