Congress is a bicameral legislature. what does that mean?

Bicameralism is the division of legislative power into two chambers.  

In the British parliament, this division consist in the House of Commons and the House of Lords.  

Can also be called, The Lower House and The Upper House.

For example, in Brazil, the Chamber of Deputies and the Federal Senate represent the Bicameralism.  

The Lower House: This is the representative house with the main role of people representation and legislative production, usually called the Lower House for historical reasons and not because it is inferior or secondary to its counterpart. The population elects its members directly.

The Upper House: This is the legislative house responsible for reviewing the laws and projects of the Lower House. It has a review role. Provides balance to the projects of the main legislative house.  

true because they can bargain

is there a year set? the question is incomplete