What is Censorship?

Dictionary Definiton (s):

Censorship1. The denial of freedom of speech or freedom of the press.2. The review of books, movies, etc., to prohibit publication and distribution, usually for reasons of morality or state security.--Oran's Dictionary of Law

Censorship: official restriction of any expression believed to threaten the political, social, or moral order.--Encyclopedia.Com

Censorship - the prevention of publication, transmission, or exhibition of material considered undesirable for the general public to possess or be exposed to.--Fast Times' Political Dictionary

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"Censorship is..."