(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)