In Protestant churches, a commemoration of Martin Luther's 95 Theses, observed on the last Sunday in October.

A reformation technique used to "strip" gasoline of impurities, improve octane rating etc.

(dated) A penal institution for juveniles, especially males.

plural of reform school

A movement in Judaism, characterized by the loosening of the strictures of much of traditional Jewish law that is seen as irrelevant to modern society, and by the shortening, simplification, and translation to the vernacular of Jewish ritual.

Opposed to reform.

A particular Anglican Church based in the United States.