The Collaborative International Dictionary of English v.0.48:

Censorship \Cen"sor*ship\, n.
   The office or power of a censor; as, to stand for a
   censorship. --Holland.
   [1913 Webster]

         The press was not indeed at that moment under a general
         censorship.                              --Macaulay.
   [1913 Webster]

WordNet (r) 3.0 (2006):

censorship
    n 1: counterintelligence achieved by banning or deleting any
         information of value to the enemy [syn: censoring,
         censorship, security review]
    2: deleting parts of publications or correspondence or
       theatrical performances [syn: censoring, censorship]