reformism

noun

1. a person who advocates or practices reform; reformer.
2. a member of any reformed denomination.

adjective

3. Also re·form·is·tic. of or belonging to a movement for reform.

noun

1. a doctrine or movement advocating reform, esp political or religious reform, rather than abolition

n.

1580s, originally religious; from reform + -ist. Political sense is from 1640s. Related: Reformism.