Definition of declassification noun from the Oxford Advanced Learner's Dictionary

 

declassification

 noun
noun
BrE BrE//ˌdiːˌklæsɪfɪˈkeɪʃn//
 
; NAmE NAmE//ˌdiːˌklæsɪfɪˈkeɪʃn//
 
[uncountable]
 
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the act of officially stating that secret government information is no longer secret