Definition: An agreed-upon set of clearly and consistently defined elements, definitions, and attributes. It helps an organization maintain consistency across their data systems. Users refer to a data dictionary to find out where specific data are located, whether they were reported correctly, how to use them appropriately, and what their values mean.
Source: Taken from National Forum on Education Statistics, http://nces.ed.gov/pubs2009/2009805.pdf
DaSy Framework Component: System Design and Development