Religious movement and Jewish branch espoused by Zacharias Frankel (1801-1875) that endeavors to preserve particular elements and customs of traditional Judaism while allowing for limited modernization such as the support of the secular Zionist movement. This branch of Judaism is governed by the idea that Judaism defines Jewish culture and national identity, and therefore, religious customs and traditions such as dietary laws, the study of Hebrew, and the observation of Sabbath, must be upheld.