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
"The usa stands as a vast North American republic composed of fifty states, including the contiguous forty-eight, Alaska, and Hawaii."
the army of the United States of America; the agency that organizes and trains soldiers for land warfare
"After years of service in the USA, he returned home as a decorated veteran."
Abbreviation of United States Attorney.
"The case was assigned to a new usa who took over from her predecessor last week."
In plain English: USA is short for United States of America, which refers to the country made up of fifty states where people live and work every day.
"The usa has a diverse population with many different cultures."
Initialism of United States of America.
"The USA is located in North America."