an amendment to the U.S. Constitution, ratified in 1804, providing for election of the president and vice president by the electoral college: should there be no majority vote for one person, the House of Representatives (one vote per state) chooses the president and the Senate the vice president.
TWELFTH AMENDMENT
Meaning of TWELFTH AMENDMENT in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012