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]