A congress is a formal meeting of the representatives of different nations, constituent states, organizations (such as trade unions, and political parties), or groups. The term, originally denoting a parley during battle in the Late Middle Ages, is derived from the Latin congressus. ( The dictionary definition of at Wiktionary)
In the mid-1770s, the term was chosen by the 13 British colonies for the Continental Congress to emphasize the status of each colony represented there as a self-governing entity. Subsequent to the use of congress as the name for the legislature of the U.S. federal government (beginning in 1789), the term has been adopted by many nations to refer to their national legislatures.
The following congresses were formal meetings of representatives of different nations:
Countries with Congresses and presidential systems:
Congress is included in the name of several political parties, especially those in former British colonies:
Many political parties also have a party congress every few years to make decisions for the party and elect governing bodies. This is sometimes called a political convention.