Merriam-Webster Collegiate Dictionary - judaism

 noun  Date: 14th century  1. a religion developed among the ancient Hebrews and characterized by belief in one transcendent God who has revealed himself to Abraham, Moses, and the Hebrew prophets and by a religious life in accordance with Scriptures and rabbinic traditions  2. conformity to Jewish rites, ceremonies, and practices  3. the cultural, social, and religious beliefs and practices of the Jews  4. the whole body of Jews ; the Jewish people