WordNet (r) 3.0 (2006):

change of mind
    n 1: a decision to reverse an earlier decision [syn: reversal,
         change of mind, flip-flop, turnabout, turnaround]

Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "change of mind":
   about-face, afterthoughts, ambitendency, ambivalence, amendment,
   better thoughts, capriciousness, change of allegiance,
   change of heart, changeableness, double-mindedness, dubiety,
   dubiousness, fence-sitting, fence-straddling, fickleness, flip,
   flip-flop, improvement, inconstancy, indecision, indecisiveness,
   infirmity of purpose, instability, irresolution, mature judgment,
   mercuriality, mugwumpery, mugwumpism, new birth, rebirth,
   reclamation, recrudescence, redemption, reform, reformation,
   regeneration, renascence, renewal, reversal, reverse, revival,
   right-about, right-about-face, second thoughts, tergiversating,
   tergiversation, turnabout, turnaround, uncertainty, undecidedness,
   undeterminedness, unsettledness, unsettlement, volte-face