Definition of Data Dictionary

1 : a collection of names of all data items used in a software system, together with relevant properties of those items; for example, length of data item, representation, etc. [SEMATECH] 2 : a resource that assists management, database administrators, systems analysts, and application programmers in planning, controlling, and evaluating the collection, storage, and use of data. [SEMATECH] 3 : a set of definitions of data flows, data elements, files, databases, and processes referred to in a leveled data flow diagram set. Also see repository. [SEMATECH]


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