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Representative

Do not abbreviate.

U.S. Congress:
            the House of Representatives, the House
            Representative Francis Downey, the representative, the congressman
            Congressman/Congresswoman is often used as a title in place of representative,
                        although technically it refers to any member of Congress.

state legislature:
             State Representative Bill Marr, Representative Bill Marr
             the state representative, the representative
             House of Delegates, the house