Orthodox Judaism ort·ho·dox·judaism uncommon noun 1. Jews who strictly observe the Mosaic Law as interpreted in the Talmud SynonymsOrthodox JudaismJewish Orthodoxy 2. beliefs and practices of a Judaic sect that strictly observes Mosaic Law SynonymsOrthodox Judaism Related words Broader terms Judaism Narrower terms HasidismHasidim Part of HarediOrthodox Jew WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.