1. (n.)Vietnam a country in SE Asia, comprising the former states of Annam, Tonkin, and Cochin-China: formerly in French Indochina; divided into NorthVietnam and SouthVietnam in 1954 and reunified in 1976. 77,311,210; 127,246 sq. mi. (329,565 sq. km).
2. (noun)Vietnam War, Vietnam a prolonged war (1954-1975) between the communist armies of NorthVietnam who were supported by the Chinese and the armies of SouthVietnam who were supported by the United States