Data Base Management System: software that mediates access to, additions and deletions of, and changes in data contained in a database, so as to store and access data efficiently and control which data particular programs or individuals are allowed to use.
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British Dictionary definitions for dbms
database management system
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012