Definitions of concepts are extremely valuable, but are they sufficient for data management? There seems to be a need for something more - for "data centric definitions". By this I am referring the definition of a table, or column, or other data object in a database. A concept definition - a full description of a business concept - is undoubtedly needed for a data object, but there is a strong case that more is required to form an adequate "data-centric definition". I do not really like calling what I am discussing here "data-centric definitions", because a definition has traditionally been thought of as a property of a concept, not of a data object. However, the term "data-centric definition" at least focuses us well on the area of interest, so I will keep it for now. Let us first try to discover if there is anything in logic that relates to the topic we are discussing. And indeed there is. Definition has been part of logic since its incep...
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