usaf usacil • usage · · · Info · Definitions · Characters · · usaf · · Text Latin · · Script 4 · · Length 2 · · Syllables Definitions · · · (noun) the airforce of the United States of America; the agency that defends the United States through control and exploitation of air and space. Synonyms: United States Air Force, U. S. Air Force, US Air Force, Air Force, USAF. · · Noun Definition 1 Characters · · a latin small letter a U+0061 f latin small letter f U+0066 s latin small letter s U+0073 u latin small letter u U+0075