Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Information classified at the highest level of sensitivity by a government, based on an assessment that it would cause exceptionally grave damage to national security if disclosed.
  • adj. A level of security clearance needed to access such information.
  • adj. Pertaining to any especially sensitive closed-room activities.

from the GNU version of the Collaborative International Dictionary of English

  • adj. containing information whose disclosure could result in grave danger to the national security; -- the highest of the three commonly known levels of national security classification, the others being confidential and secret.
  • adj. kept secret by very careful and strict rules for disclosure.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. the highest official level of classification of documents

Etymologies

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