Rabbinic theological language has made possible a vast range of discourse, on many subjects over long spans of recorded time and in diverse cultural settings. This theological dictionary defines the principal theological usages of Rabbinic Judaism as set forth in the Rabbinic canon of late antiquity, Mishnah, Talmuds, and Midrash-compilations. It systematically lays [1] the theological categories that are native to those writings; [2] cogent statements that can be made with them; [3] coherent propositions that those statements set forth and (within their own terms and framework) logically demonstrate as true and self-evident, both. Volume One of this dictionary covers vocabulary that permits the classification of religious knowledge and experience, and the organization and categorization of those data into intelligible and cogent sense-units.