Dictionary
top secret
adjective
: kept completely secret by high government officials
Full Definition of TOP SECRET
1
: protected by a high degree of secrecy <a top secret weapon> <a top secret meeting>
2
a : containing or being information whose unauthorized disclosure could result in exceptionally grave danger to the nation <top secret messages> — compare confidential, secret b : of or relating to top secret documents <a top secret clearance>
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First Known Use of TOP SECRET
1944
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