A public display of group opinion, such as a protest march.
A proof.
Expression of one's feelings by outward signs.
The act of demonstrating; showing or explaining something.
A prisoner's act of beating up another prisoner.
An event at which something will be demonstrated.
A show of military force.
The state of being unknown; a thing that is unknown.
The quality of being difficult to understand; a thing that is difficult to understand.
Darkness; the absence of light.