aec a. e. burnside • Aechmophorus · · · Info · Definitions · Characters · · aec · · Text Latin · · Script 3 · · Length 1 · · Syllables Definitions · · · (noun) a former executive agency (from 1946 to 1974) that was responsible for research into atomic energy and its peacetime uses in the United States. Synonyms: Atomic Energy Commission, AEC. · · Noun Definition 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065