top-se·cret

[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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Top-secret is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Example sentences
Nor is he trying to protect the top-secret business model of one of the dozens of start-ups he is advising or has financed.
The couple pulled off the near-impossible: a top-secret wedding.
Early in his career, he was selected to build a top-secret satellite, and he's been inventing ever since.
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