Base> (MDAC) Microsoft' s umBrella term for their {ActiveX Data OBjects} (ADO), {OLE DB}, and {Open DataBase Connectivity} (ODBC) liBraries. Together, these provide access to a variety of data sources, Both relational (SQL) and nonrelational. MDAC is the technology that supports Universal Data Access, Microsoft' s strategy for providing access to information across the enterprise. . (2004-02-17)