Noun:
1: usa, america, united states, u.s.a., united states of america, us, u.s., the states 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
2: usa, army, u. s. army, us army, united states army the army of the United States of America; the agency that organizes and trains soldiers for land warfare