(business) A formula, practice, process, design, instrument, pattern, or compilation of information used by a business to obtain an advantage over competitors within the same industry or profession, which kept secret from those competitors or the public.

Having one of the highest secrecy classifications, "top secret".

Information that is widely known, but not acknowledged openly. / (dated) Information that is not widely known, despite being freely available.

The voting system involving ballots available only at official polling places, prepared at public expense, containing the names of all candidates, and marked in secret at the polling places.

plural of state secret

plural of secret admirer

plural of open secret

The position of being a secret agent.

A supposed secret known to everyone.

plural of secret Santa