noun

1. a written challenge, as to a duel
2. a written agreement between nations at war, esp. as to the exchange of prisoners

3. Etymology: Ger kartell < Fr cartel

   an association of industrialists, business firms, etc. for establishing a national or international monopoly by price fixing, ownership of controlling stock, etc.; trust
4. a political bloc in certain European countries

Etymology: MFr < It cartello, dim. of carta, card