A Database (or Data Base) is an interrelated and a computerised system for the logical collection of information that makes it easy to search, select and store data or information, and managed as a unit using formal design, analysis, reporting, etc.
Reference Definition by Aiche.org: Data Base is 1) a repository for equipment reliability information categorized to facilitate data retrieval; 2) tabular lists of multiple data vectors, with little text except that needed to explain the data presentation format.
Related Definitions in the Project: The Project Management; Project Administration