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English definition of “declassify”

declassify

verb [T] uk   /ˌdiːˈklæs.ɪ.faɪ/ us  
to say officially that political or military information is no longer secret: Many government documents are declassified after 50 years.Revealing secrets and becoming known
declassification
noun [U] uk   /ˌdiː.klæs.ɪ.fɪˈkeɪ.ʃən/ us  
Revealing secrets and becoming known
(Definition of declassify from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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