What does declassify mean?
Declassify is a formal verb meaning to officially strip a document, file, or body of information of its classified — that is, secret — status, thereby making it accessible to the public or to officials without the necessary security clearance. It belongs almost entirely to the vocabulary of government, intelligence, law, and journalism: archives are declassified after fixed review periods, presidents and ministers may declassify material by executive decision, and campaigns for transparency often demand that historical records be declassified. The word carries connotations of openness, accountability, and the passage of time, since material is usually declassified once secrecy no longer serves a national interest. Its noun form, declassification, names the process itself. Because it combines the prefix de- ('to reverse') with classify, the word neatly encapsulates its own meaning: the undoing of official secrecy. It remains an indispensable term in any serious discussion of government transparency.
verbTo officially remove the classified status of a document or piece of information, making it available to the public or to people without security clearance.
- (of a government or authority) to officially remove the 'classified' designation from a document, file, or piece of information so that it is no longer secret
"The government finally agreed to declassify the files relating to the 1962 incident."
"The agency was ordered to declassify more than 900 pages of Cold War intelligence reports."
"Under pressure from historians and journalists, the ministry moved to declassify wartime archives."
In the United States, a president can declassify top-secret material simply by deciding it's no longer secret — no signature or ceremony required.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of declassify
Declassify is formed from the prefix de-, indicating reversal or removal, combined with classify, which derives from French classer and ultimately from Latin classis, meaning 'a class or division' (originally a division of the Roman people). The compound arose in the twentieth century alongside modern systems of official secrecy, particularly during and after the World Wars when governments developed formal categories for sensitive documents. It shares the Latin root classis with words such as classic and classical.
Related word forms
How declassify is actually used
Formal register, used almost exclusively in political, governmental, legal, and journalistic contexts concerning state secrets and official documents. Typically appears in passive constructions such as 'the documents were declassified.'
Easily confused with declassify
Reclassify means to assign something a different category or classification level, whereas declassify means to remove its secret status entirely.
Disclose is the general act of revealing information, while declassify specifically refers to the official removal of government security classification.