Judaism

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 :  the cultural, social, and religious beliefs and practices of the Jews

3 :  conformity to Jewish rites, ceremonies, and practices

4 :  the whole body of Jews :  the Jewish people