top secret
MATERIAL THAT GOVERNMENT CLAIMS REQUIRES CONFIDENTIALITY
Security classification; Top secret; Top-secret; Classified document; Official secret; Unclassified; Cosmic Top Secret; Classified Information; National security classification; State secrets; Classified intelligence; Top Secret; TOP SECRET; Top-secret information; Secret clearance; Classified matter; National secret; Commercial-in-confidence; UNCLAS; TSNV; TSPV; Commission consultative du secret de la défense nationale; CCSDN; (U); Information classification; VS-Vertraulich; Commercial in confidence; Classified material; Restreint UE; ATOMAL; Yderst hemmelig; LIMDIS; Classified documents
Top secret information or activity is intended to be kept completely secret, for example in order to prevent a country's enemies from finding out about it.
The top secret documents had to do with the most advanced military equipment...
ADJ: usu ADJ n