The Collaborative International Dictionary of English v.0.48:

Revaluation \Re*val`u*a"tion\, n.
   A second or new valuation.
   [1913 Webster]

WordNet (r) 3.0 (2006):

revaluation
    n 1: a new appraisal or evaluation [syn: reappraisal,
         revaluation, review, reassessment]