top secret

top-secret

[top-see-krit]
adjective (of information, a document, etc.)
1.
bearing the classification top-secret, the highest level of classified information.
2.
limited to persons authorized to use anything so classified. Compare classification ( def 5 ).

Origin:
1940–45; top1 + secret

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World English Dictionary
top-secret
 
adj
containing information whose disclosure would cause exceedingly grave damage to the nation and therefore classified as needing the highest level of secrecy and security

Collins English Dictionary - Complete & Unabridged 10th Edition
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