"Dom" is the title of the religious of the Benedictine and Cistercian orders; an abbreviation of "Dominus," originally applied to the popes, later to bishops, and finally to monks. "Don" is used in Italy for all clerks except Mendicant Friars and Regular Clerks. The form "Dan" was employed in medieval English, and "Monsieur" has always been used in France.
This dictionary contains not only definitions and explanations of every subject in Religion, Scripture, tradition, doctrine, morals, sacraments, rites, customs, devotions and symbolism, but also accounts of the Church in every continent, country, diocese; missions, notable Catholic centers, cities, and places with religious names; religious orders, church societies, sects and false religions. It has brief articles also on historical events and personages, on the Old Testament and New, and on popes, prelates, priests, men and women of distinction, showing what the Church has done for civilization and correcting many errors which have hitherto passed for history.Wikipedia
Read More