Hasidism ha·si·dism UK/ˈxɑːsɪdɪzm/ US/ˈhɑːsɪdɪzm/ uncommon noun 1. beliefs and practices of a sect of Orthodox Jews SynonymsHassidismChasidismChassidism Related words Broader terms Orthodox Judaism Narrower terms Chabad WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.