A collection of (usually) organized information in a regular structure, usually but not necessarily in a machine-readable format accessible by a computer.
A set of tables and other objects (queries, reports, forms) in the form of a structured data set.
A software program (application) for storing, retrieving and manipulating such a structured data set.
A combination of such data sets and the programs for using them.
To enter data into a database.
A miscellaneous collection of different things; a miscellany.