declassify Syllabification: (de·clas·si·fy)Pronunciation: /dēˈklasəˌfī/Translate declassify | into Italian Definition of declassify verb (declassifies, declassifying, declassified) [with object] officially declare (information or documents) to be no longer secret:government documents were declassifiedDerivatives declassificationPronunciation: /dēˌklasəfiˈkāSHən/ noun declassify in other Oxford dictionaries Definition of declassify in the British & World English dictionary