top secret

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top secret (not comparable)

  1. (military) 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.
    NSA's report on the Liberty incident was originally classified top secret.
  2. A level of security clearance needed to access such information.
  3. (figuratively) Pertaining to any especially sensitive closed-room activities.
    Steve Jobs set up a top secret team to design the Macintosh.


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