名詞 u.s.a.:

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
   同義詞：United States, United States of America, America, the States, US, U.S., USA
2. the army of the United States of America; the agency that organizes and trains soldiers for land warfare
   同義詞：United States Army, US Army, U. S. Army, Army, USA