A word which denotes that which must be as it is without the possibility of being otherwise. It is opposed to contingency, a state or condition or event which need not be as it is, and hence may be, or might have been, otherwise. Logical or mathematical necessity is that which unavoidably, unalterably follows from accepted principles or postulates. Physical necessity is but the constant behavior of the things of nature; thus, the sun must rise. Moral necessity is obligatory conduct for beings possessing free will. Thus, it is morally necessary to keep promises and contracts.
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
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