US Army uncommon noun 1. the army of the United States of America; organizes and trains soldiers for land warfare SynonymsUnited States ArmyUS ArmyU. S. ArmyUSA Related words Word family US Army Criminal Investigation Laboratory Broader terms army Parts Department of Defense Part of Army High Performance Computing Research CenterCriminal Investigation CommandSpecial ForcesUnited States Army RangersUnited States Military AcademyArmy IntelligenceArmy National Guard WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.