Pronunciation: (vē-et"näm', -nam', vyet"-, vē"it-),[key] —n. 1. Official name, Socialist Republic of Vietnam. a country in SE Asia, comprising the former states of Annam, Tonkin, and Cochin-China: formerly part of French Indochina; divided into North Vietnam and South Vietnam during the Vietnam War but now reunified. 49,200,000; 126,104 sq. mi. (326,609 sq. km). Cap.: Hanoi. Cf. North Vietnam, South Vietnam. 2. See Vietnam War.Also,Vi•et" Nam'.