1. the national legislative body of a country.
a particular session of the US Congress. "the 104th Congress"
2.a formal meeting or series of meetings for discussion between delegates, especially those from a political party or labor union or from within a particular discipline.
The original purpose of the United States Congress was as a legislative body intended to be representative of the franchise-holding citizens of the country, divided into a bicameral legislature on the basis of A) population and B) geography.
Its current composition is largely a collection of millionaires who represent the interests of billionaires. It is drawn from two ostensibly different political parties, who differ mainly on how to best serve those billionaires. Their chief preoccupation is doing so while attempting to blame each other for the consequences of their actions in that service while raising funds for the next round of elections.