Definition of top secret in English:
Of the highest secrecy; highly confidential: the experiments were top secret a top-secret mission
More example sentences
- He handled - and secretly photographed - top-secret military documents that crossed his desk.
- The real reason he is never free to visit you isn't because the CIA forbids him from leaving his top-secret mission in Uruguay.
- I knew they couldn't because a few days before their president had provided me with a top-secret document from the computer.
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