Meaning of “declassify” in the English Dictionary

"declassify" in British English

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declassifyverb [ T ]

uk /ˌdiːˈklæs.ɪ.faɪ/ us /ˌdiːˈklæs.ə.faɪ/

to say officially that political or military information is no longer secret:

Many government documents are declassified after 50 years.
declassification
noun [ U ] uk /ˌdiː.klæs.ɪ.fɪˈkeɪ.ʃən/ us /ˌdiː.klæs.ə.fəˈkeɪ.ʃən/

(Definition of “declassify” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)