The Collaborative International Dictionary of English v.0.48:

Cartel \Car"tel\, v. t.
   To defy or challenge. [Obs.]
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         You shall cartel him.                    --B. Jonson.
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The Collaborative International Dictionary of English v.0.48:

Cartel \Car*tel"\, n. [F., fr. LL. cartellus a little paper,
   dim. fr. L. charta. See 1st Card.]
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   1. (Mil.) An agreement between belligerents for the exchange
      of prisoners. --Wilhelm.
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   2. A letter of defiance or challenge; a challenge to single
      combat. [Obs.]
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            He is cowed at the very idea of a cartel., --Sir W.
                                                  Scott.
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   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.
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WordNet (r) 3.0 (2006):

cartel
    n 1: a consortium of independent organizations formed to limit
         competition by controlling the production and distribution
         of a product or service; "they set up the trust in the hope
         of gaining a monopoly" [syn: trust, corporate trust,
         combine, cartel]