cartel

cartel is a   Noun

Definition:

[1] An agreement between belligerents for the exchange of prisoners. Wilhelm.

[2] A letter of defiance or challenge; a challenge to single combat. [Obs.] He is cowed at the very idea of a cartel., Sir W. Scott. Cartel, or Cartel ship, a ship employed in the exchange of prisoners, or in carrying propositions to an enemy; a ship beating a flag of truce and privileged from capture.

Synonyms: