[ dee-klas-uh-fahy ]
/ diˈklæs əˌfaɪ /

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

Examples from the Web for declassify

British Dictionary definitions for declassify


/ (diːˈklæsɪˌfaɪ) /

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 declassify



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