A social and religious movement in Judaism founded in 18th-century Poland. It stresses the importance of devotion in prayer and serving God in ecstasy amid day-to-day life. Hasidic Judaism is usually structured around a “rebbe,” or revered spiritual teacher whose interpretations of Jewish law govern the community. Its followers, called Hasidim, are among the most traditional of U.S. Orthodox Jews. Hasidic is the adjectival form.