(n.) The act or operation of meliorating, or the state of being meliorated; improvement.

about-turn accommodation adaptation adjustment afterthoughts alchemy alteration amelioration apostasy assimilation assumption back track back trail backing backing off backing out backing up backsliding backup becoming better thoughts betterment break change change of heart change of mind change-over changeableness constructive change continuity conversion defection degeneration degenerative change deterioration deviation difference discontinuity disenchantment divergence diversification diversion diversity do an about-face face about fitting flip flip-flop gradual change growth improvement lapse mature judgment melioration mitigation modification modulation naturalization overthrow passage progress qualification radical change re-creation re-formation realignment recidivation recidivism reclamation reconversion redesign reduction reform reformation regress regression rehabilitation reinstatement relapse remaking renewal reshaping resolution restitution restoration restructuring retrocession retrogradation retrogression retroversion return returning reversal reverse reversing reversion reverting revival revivification revolution revulsion right-about right-about-face second thoughts shift slipping back sudden change swingaround switch switch-over tergiversating tergiversation total change transformation transit transition turn turnabout turnaround turning into upheaval variation variety violent change volte-face worsening