That serves to reform or correct

Any of several movements that promote reform

to improve society by removing abuse and injustices

a person who works to make something better or fairer

(inorganic chemistry) The production of hydrogen (and carbon monoxide) from water and methane at high temperature

(historical) A period of Roman Catholic revival that aimed to combat the Reformation.

The Protestant Reformation in Switzerland

Individual ideological indoctrination, especially that conducted in Communist China under Mao Zedong.

an approach to mathematics education, particularly in North America

(grammar, linguistics) A deliberate, often authoritatively sanctioned or mandated change to spelling rules.