Hasidim (Hebrew: חסידים‎) is the plural of Hasid (חסיד), meaning "pious" or "righteous". The word Hasid was frequently used as a term of exceptional respect in the Talmudic and early medieval periods. In the aggregate, it may refer to members of any of the following Jewish movements:

• Hasidic Judaism, a Ukrainian Jewish movement from the 17th century onwards
• Hasideans, pietists or "Jewish Puritans" of the Maccabean period
• Chassidei Ashkenaz, a German pietistic movement of the 12th and 13th centuries

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