Software used to index and retrieve content that exists within or for an organization, ideally optimized for specific enterprise business requirements.
For an extensive collection of enterprise search news and blog posts see https://gilbane.com/category/enterprise-search-search-tech/
For additional definitions related search and text retrieval see Lynda Moulton’s glossary:
https://gilbane.com/wp-content/uploads/2009/01/Glossary-Taxonomy-and-Search-012009.pdf