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