Ofˌficial ˈSecrets ˌAct, the BrE AmE
a UK law by which people who work for the government are not allowed to discuss their work with people who do not work for the government or to make known information which should be kept secret. Government workers must ‘sign the Official Secrets Act’ (=agree to obey this law) , and they can be put in prison if they break this agreement. ⇨ compare ↑ Freedom of Information Act