'USA' definitions:

noun

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 [syn: United States, United States of America, America, the States, US, U.S., USA, U.S.A.]

noun

The army of the United States of America; the agency that organizes and trains soldiers for land warfare [syn: United States Army, US Army, U. S. Army, Army, USA]