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USA

also U.S.A., abbreviation of United States of America, in use by 1814 in addresses, etc.; not common otherwise before c. 1920. Before then it often also meant United States Army.

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Definitions of USA

usa (n.)
North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776;
Synonyms: United States / United States of America / America / the States / us / U.S. / U.S.A.
usa (n.)
the army of the United States of America; the agency that organizes and trains soldiers for land warfare;
Synonyms: United States Army / US Army / U. S. Army / Army
From wordnet.princeton.edu