The practice of keeping secrets.
protection from observation or surveillance.
The condition of being hidden or concealed.
A body of objectively verifiable facts that are positively indicative of, and/or exclusively concordant with, that one conclusion over any other.
Facts or observations presented in support of an assertion.
Anything admitted by a court to prove or disprove alleged matters of fact in a trial.
One who bears witness.
To provide evidence for, or suggest the truth of.