Use the proper noun Congress when you're talking about the legislative branch of the United States government, made up of the Senate and the House of Representatives.

When you're talking about the legislature, Congress has to start with a capital C to distinguish it from other meanings of the word. The U.S. Congress is made up of elected senators and representatives from all fifty states who vote on and enact new laws. In late Middle English, congress meant a "meeting during battle," from the Latin congressus, which means both "a friendly meeting" and "a hostile encounter," both of which, in fact, describe the United States Congress.

Definitions of Congress

n the legislature of the United States government

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