Source : WordNet®

USA
     n 1: 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}, {US}, {U.S.},
           {U.S.A.}]
     2: the army of the United States of America; organizes and
        trains soldiers for land warfare [syn: {United States Army},
         {US Army}, {U. S. Army}]