The Collaborative International Dictionary of English v.0.48:

Renascence \Re*nas"cence\ (r?-n?s"sens), n. [See Renascent,
   and cf. Renaissance.]
   1. The state of being renascent.
      [1913 Webster]

            Read the Ph[oe]nix, and see how the single image of
            renascence is varied.                 --Coleridge.
      [1913 Webster]

   2. Same as Renaissance.
      [1913 Webster]

            The Renascence . . . which in art, in literature,
            and in physics, produced such splendid fruits. --M.
                                                  Arnold.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Renascence
    n 1: the period of European history at the close of the Middle
         Ages and the rise of the modern world; a cultural rebirth
         from the 14th through the middle of the 17th centuries
         [syn: Renaissance, Renascence]
    2: a second or new birth [syn: reincarnation, rebirth,
       renascence]
    3: the revival of learning and culture [syn: rebirth,
       Renaissance, Renascence]

Moby Thesaurus II by Grady Ward, 1.0:

58 Moby Thesaurus words for "renascence":
   amendment, change of allegiance, change of heart, change of mind,
   copy, duplication, imitation, improvement, new birth, palingenesis,
   palingenesy, re-creation, re-formation, reanimation, rebirth,
   rebuilding, reclamation, reconstitution, reconstruction,
   recrudescence, redemption, redesign, redoing, reedition,
   reestablishment, refashioning, reform, reformation, refreshment,
   regeneracy, regenerateness, regeneration, regenesis, reinstitution,
   reissue, rejuvenation, rejuvenescence, remaking, renaissance,
   renewal, renovation, reorganization, repetition, reprinting,
   reproduction, reshaping, restoration, restructuring, resurgence,
   resurrection, resuscitation, revision, revival, revivescence,
   revivescency, revivification, second wind, second youth