plural of trade secret

plural of open secret

plural of secret of Polichinelle

plural of state secret

plural of best-kept secret

(military, government) Information classified at one of the highest levels of sensitivity by a government, based on an assessment that it would cause exceptionally grave damage to national security if disclosed.

A secret that is classed as "top secret"; a top-secret secret; top-secret information. / Used other than figuratively or idiomatically: see top, secret.

A police force operating in secrecy and outside the normal boundaries of law and hidden from the public, usually in support of a totalitarian government's political policies to suppress political dissent through the use of methods including intimidation, violence, and surveillance.

One who admires another romantically but purposely remains anonymous to the extent that the subject of the admiration is unaware of the admirer's identity.

A Christmas tradition where a group of people give anonymous gifts to each other, with each person randomly selected to give a gift to one other person.