The Collaborative International Dictionary of English v.0.48:

Perpetuation \Per*pet`u*a"tion\, n. [Cf. F. perp['e]tuation.]
   The act of making perpetual, or of preserving from extinction
   through an endless existence, or for an indefinite period of
   time; continuance. --Sir T. Browne.
   [1913 Webster]

WordNet (r) 3.0 (2006):

perpetuation
    n 1: the act of prolonging something; "there was an indefinite
         prolongation of the peace talks" [syn: prolongation,
         protraction, perpetuation, lengthening]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "perpetuation":
   continualness, continuance, continuation, continuity, endurance,
   eternal re-creation, eternal return, eternalization, extension,
   immortalization, lengthening, maintenance, perseverance,
   persistence, preservation, progress, progression, prolongation,
   protraction, pursuance, repetition, run, staying power,
   steady-state universe, straight course, sustained action,
   sustenance, uninterrupted course, unremittingness, way