Pronunciation: (kär-tel'),[key] —n. 1. an international syndicate, combine, or trust formed esp. 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, esp. for the exchange of prisoners.
4. a written challenge to a duel.