A country in Southeast Asia, on the east coast of the Indochina Peninsula, officially named Socialist Republic of Vietnam, The Vietnam War, noun_ A long war which a dominating foreign occupier of a place (the site of the war) cannot win, a communist state in Indochina on the South China Sea; achieved independence from France in 1945, a prolonged war (1954-1975) between the communist armies of North Vietnam who were supported by the Chinese and the armies of South Vietnam who were supported by the United States