verb (used with object), de·clas·si·fied, de·clas·si·fy·ing.

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

First recorded in 1860–65; de- + classify
Related formsde·clas·si·fi·a·ble, adjectivede·clas·si·fi·ca·tion [dee-klas-uh-fi-key-shuh n] /diˌklæs ə fɪˈkeɪ ʃən/, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for declassified

publicize, exhibit, display, show

Examples from the Web for declassified

Contemporary Examples of declassified

Historical Examples of declassified

  • 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

  • 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

British Dictionary definitions for declassified


verb -fies, -fying or -fied

(tr) to release (a document or information) from the security list
Derived Formsdeclassifiable, adjectivedeclassification, 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

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