Book excerpt: This reference is a pioneering work which explores and defines the many factors which characterise the historic and ongoing relationship between the two traditions. From Aaron to Zionism, the editors have brought together over 700 entries--including events, institutions, movements, people, places and publications--contributed by more than 100 internationally renowned scholars. The Dictionary, compiled under the auspices of the Cambridge-based Centre for the Study of Jewish-Christian Relations, offers a focus for the study and understanding of Jewish-Christian relations internationally, both within and between Judaism and Christianity.