a comprehensive collection of related data organized for convenient access, generally in a computer.
Also, data-base, data base.

1965–70; data + base1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
database (ˈdeɪtəˌbeɪs)
1.  a systematized collection of data that can be accessed immediately and manipulated by a data-processing system for a specific purpose
2.  informal any large store of information: a database of knowledge

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
database   (dā'tə-bās', dāt'ə-)  Pronunciation Key 
A collection of data arranged for ease and speed of search and retrieval by a computer.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

database definition

A set of data grouped together in one location in (or accessible by) a computer. A computerized database has been likened to an electronic filing cabinet of information arranged for easy access or for a specific purpose.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
It contains information for the layperson as well as databases of published
  studies, including human clinical trials.
What is sad is that a dispatcher's use of freely available technology, not
  advanced databases, could have defused the whole event.
For the younger generation of reporters, their whole social media history is
  archived in various databases.
They work at law firms and spend much of their time in the library or accessing
  legal databases through their computers.
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