The use of state or group power to control freedom of expression or press, such as passing laws to prevent media from being published or propagated.

plural of censorship

The use of corporate influence to limit freedom of expression, achieved through refusal to sell a product, or refusal to advertise or allow airtime.

(physics) The hypothesis that Einstein's general relativity theory singularities are always hidden from the remote observer, and are only visible as black holes.

plural of self-censorship

The act of censoring one's own work or what one says without overt pressure from any specific party or institution of authority, often for fear of sanctions.

A conjecture that expects that all spacetime singularities are enclosed within event horizons.