knowledge base

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A collection of data organized in a form that facilitates analysis by automated deductive processes, such as an expert system.
• noun The collection of information representing the collective knowledge of an organization, arranged for easy search and retrieval.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A database designed to meet the complex storage and retrieval requirements of computerized knowledge management, especially in support of artificial intelligence or expert systems.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the content of a particular field of knowledge