an island, belonging to the U.S., in the N Pacific, E of the Philippines: the largest of the Marianas group; U.S. naval station. 84,996; 206 sq. mi. (535 sq. km). Capital:Agaña. Abbreviation:GU (for use with zip code).
Guam (gwäm) Abbr. GU An unincorporated territory of the United States, the largest and most southerly of the Mariana Islands in the western Pacific Ocean. Discovered by Magellan in 1521, the island was ceded by Spain to the United States in 1898. Agana is the capital. Population: 173,000. Gua·ma'ni·an (gwä-mā'nē-ən) adj. & n.
A self-governing island territory of the United States, located in the western Pacific Ocean. With important naval and air bases, Guam is an American military bastion in the Pacific.