(colloquial) Initialism of United States of America. / (US, military) Initialism of United States Army. / (nonstandard) Initialism of Union of South Africa.

Abbreviation of United States Attorney.

market share

plural of usability

(obsolete) One who has the use of anything held in trust for another.

plural of usager

(linguistics, rare) One who defines a language by usage rather than theory.

(rare, derogatory) A self-appointed authority on language usage.

Former name of USAAF (“United States Army Air Force”). (now, USAF (“United States Air Force”)) Initialism of United States Army Air Corps.

Former name of USAAC (“United States Army Air Corps”). (now, USAF (“United States Air Force”)); Initialism of United States Army Air Service.