car⋅tel /kɑrˈtɛl/ kahr-tel]
1. an international syndicate, combine, or trust formed especially to regulate prices and output in some field of business.
2. a coalition of political or special-interest groups having a common cause, as to encourage the passage of a certain law.
3. a written agreement between belligerents, especially for the exchange of prisoners.
* Last but not least, my favorite definition...
4. a written challenge to a duel.