The Collaborative International Dictionary of English v.0.48:

Reassessment \Re`as*sess"ment\ (r[=e]`[a^]s*s[e^]s"ment, n.
   A renewed or second assessment.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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