to change amend or alter (something) for the better
to put an end to (an evil) by enforcing or introducing a better method or course of action
to induce or cause (somebody) to adopt a more virtuous, healthier, etc way of life
to become changed for the better
reformable adj
reformative /-tiv/ adj
reformatory /-mət(ə)ri/ adj
[Middle English reformen via French from Latin reformare, from re- + formare to form, from forma form1]