Although the word ecclesiology," meaning "the study of Church," is recent in the history of theology, ecclesiology as a recognized theology emerged slowly. Its reflections on the nature, function, and structures of the Church date back to New Testament times. Ecclesia sheds light on this study by presenting invaluable information on a wide range of toics about the Church. Since Vatican II, an integration of many theological disciplines and fields has enriched our understanding of the Church, and this reference work continues that education for al who seek a deeper understanding of the Church and its background. "