1. (noun)army, regular army, ground forces a permanent organization of the military land forces of a nation or state Synonyms: regulararmy, ground forces, army
2. (noun)army a large number of people united for some specific purpose Synonyms: regulararmy, ground forces
3. (noun)United States Army, US Army, U. S. Army, Army, USA the army of the United States of America; the agency that organizes and trains soldiers for land warfare Synonyms: regulararmy, ground forces, the States