Wordnet 3.0
NOUN (1)
1. 
 a former executive agency (from 1946 to 1974) that was responsible for research into atomic energy and its peacetime uses in the United States; 
[syn: Atomic Energy Commission, AEC]
WordNet (r) 3.0 (2006):
AEC
    n 1: a former executive agency (from 1946 to 1974) that was
         responsible for research into atomic energy and its
         peacetime uses in the United States [syn: Atomic Energy
         Commission, AEC]
V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
AEC
       Advanced Error Correction (CD)