Wordnet 3.0
NOUN (1)
1. 
 the United States cryptologic organization that coordinates and directs highly specialized activities to protect United States information systems and to produce foreign intelligence information; 
[syn: National Security Agency, NSA]
WordNet (r) 3.0 (2006):
NSA
    n 1: the United States cryptologic organization that coordinates
         and directs highly specialized activities to protect United
         States information systems and to produce foreign
         intelligence information [syn: National Security Agency,
         NSA]
V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
NSA
       National Security Agency (org., USA)