1. top secret - Noun
2. top secret - Adjective
3. top secret - Adjective Satellite
the highest official level of classification of documents
Source: WordNettop-secret
An Aberdeen teacher has written a children’s e-book about a top-secret organisation which takes revenge on unruly adults, with all of the profits going towards a charity. Source: Internet
A number of the long hull Sturgeon-class SSNs, including Parche, L. Mendel Rivers, and Richard B. Russell were involved in top-secret reconnaissance missions, including cable tap operations in the Barents and Okhotsk seas. Source: Internet
Conditions in the European theatre made it very difficult to achieve the accuracy that had been possible using the exceptional and top-secret Norden optical bombsight in the clear skies over the desert bombing ranges of Nevada and California. Source: Internet
Another MKUltra effort, Subproject 54, was the Navy's top secret "Perfect Concussion" program, which was supposed to use sub-aural frequency blasts to erase memory. Source: Internet
A top secret Swedish military opinion given to the USAF in 1948 stated that some of their analysts believed that the 1946 ghost rockets and later flying saucers had extraterrestrial origins. Source: Internet
A spy is a person employed to seek out top secret information from a source. Source: Internet