official secret 
noun British
A piece of confidential information that is important for national security: it is a crime to disclose an official secret...
- I should like to emphasise with all the power at my command that this case is not primarily about national security or official secrets.
- It is interesting that the attorney general's advice should still be an official secret despite the freedom of information act.
- Apart from extending the protection of official secrets to include any government document, the Bill makes it easier to jail journalists or anyone else found with a leaked government document.
- paddle-plane
- paddle pop
- paddler
- paddle shaft
- paddle steamer
- paddle tennis
- paddle wheel
- paddlewheeler
- paddlewood
- paddling
- paddling pool
- paddo
- paddock
- paddock bomb
- paddock course
- paddock critic
- paddock-graze
- paddock grazing
- paddock-pipe
- paddock redd
- paddock rud
- paddock sheet
- paddock's pipe
- paddock's spindle
- paddock-stool