Top secret

adj, noun

Definitions

Adjective
  1. 1
    Information classified at one of the highest levels of sensitivity by a government, based on an assessment that it would cause exceptionally grave damage to national security if disclosed. not-comparable

    "NSA's report on the Liberty incident was originally classified top secret."

  2. 2
    A level of security clearance needed to access such information. not-comparable
  3. 3
    Pertaining to any especially sensitive closed-room activities. figuratively, not-comparable

    "Steve Jobs set up a top secret team to design the Macintosh."

Noun
  1. 1
    A secret that is classed as "top secret"; top-secret information.
  2. 2
    Used other than figuratively or idiomatically: see top, secret.

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