cartels

noun

1. 1

   A group of businesses or nations that collude to limit competition within an industry or market.

   “car cartel”

2. 2

   A combination of political groups (notably parties) for common action.

3. 3

   A written letter of defiance or challenge.

4. 4

   An official agreement concerning the exchange of prisoners.

5. 5

   A ship used to negotiate with an enemy in time of war, and to exchange prisoners.