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[dee-klas-uh-fahy] /diˈklæs əˌfaɪ/
verb (used with object), declassified, declassifying.
to remove the classification from (information, a document, etc.) that restricts access in terms of secrecy, confidentiality, etc.
Compare classification (def 5).
Origin of declassify
1860-65; de- + classify
Related forms
declassifiable, adjective
[dee-klas-uh-fi-key-shuh n] /diˌklæs ə fɪˈkeɪ ʃən/ (Show IPA),
noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for declassified
Contemporary Examples
Historical Examples
  • You know, of course, about the A-bomb, H-bomb and C-bomb because information that they existed had been declassified.

    Project Hush Philip Klass
  • Even though he had not been tried as yet, he had effectively been declassified.

    But, I Don't Think Gordon Randall Garrett
  • At any rate, the process had gone along smoothly, even as the present process of using Class Sevens and declassified citizens did.

    But, I Don't Think Gordon Randall Garrett
  • It is marked "limited official use," and I think that should be declassified for this purpose.

    Warren Commission (5 of 26): Hearings Vol. V (of 15) The President's Commission on the Assassination of President Kennedy
British Dictionary definitions for declassified


verb -fies, -fying, -fied
(transitive) to release (a document or information) from the security list
Derived Forms
declassifiable, adjective
declassification, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for declassified



1865, originally a term in logic; with reference to state secrets, 1946; from de- + classify. Related: Declassification; declassified; declassifying.

Online Etymology Dictionary, © 2010 Douglas Harper
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