semantic web: an extension of the World Wide Web in which the semantics of information and services on the web is defined making it easier to find, share, reuse and combine information.
related terms: XML, Resource Description Framework (RDF), Web Ontology Language (OWL), ontologies
more information:
W3C Semantic Web Activity
semanticweb.org
What is the Semantic Web? (webopedia)
Berners-Lee, T., Hendler, J., & Lassila, O. (2001). The Semantic Web. Scientific American, 284(5), 34-44. (see ORR)