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(artificial intelligence)
A large knowledge-based system.

Cyc is a very large, multi-contextual knowledge base and inference engine, the development of which started at the Microelectronics and Computer Technology Corporation (MCC) in Austin, Texas during the early 1980s.

Over the past eleven years the members of the Cyc team, lead by Doug Lenat, have added to the knowledge base a huge amount of fundamental human knowledge: facts, rules of thumb, and heuristics for reasoning about the objects and events of modern everyday life.

Cyc is an attempt to do symbolic AI on a massive scale. It is not based on numerical methods such as statistical probabilities, nor is it based on neural networks or fuzzy logic. All of the knowledge in Cyc is represented declaratively in the form of logical assertions. Cyc presently contains approximately 400,000 significant assertions, which include simple statements of fact, rules about what conclusions to draw if certain statements of fact are satisfied, and rules about how to reason with certain types of facts and rules. The inference engine derives new conclusions using deductive reasoning.

To date, Cyc has made possible ground-breaking pilot applications in the areas of heterogeneous database browsing and integration, captioned image retrieval, and natural language processing.

In January of 1995, a new independent company named Cycorp was created to continue the Cyc project. Cycorp is still in Austin, Texas. The president of Cycorp is Doug Lenat.

The development of Cyc has been supported by several organisations, including Apple, Bellcore, DEC, DoD, Interval, Kodak, and Microsoft.

Unofficial FAQ.
References in periodicals archive ?
The WSCC organizers will choose an annotation scheme that is (partly) based on an existing taxonomy, such as that given by OpenCyc (4) or DBPedia.
OpenCyc (5)), Wordnet (6) (Miller 1995) and McRae's NORMS (7) for determining congruent properties and systematizing features as points or regions upon corresponding quality domains.
OpenCyc can be downloaded in OWL format or directly be accessed as a RDF store using web services from Cycorp.
Figure 3 shows an example output for a homepage annotations produced by Enrycher [18], where the identified named entities are linked to concepts in DBPedia, OpenCyc and GeoNames.
OpenCyc: OpenCyc es la version de codigo abierto de la tecnologia CyC mas completa base de conocimientos generales del mundo y motor de razonamiento de sentido comun (Cycorp, 2013).
org/concept/Mx4rvViynJwpEbGdrcN5Y29ycA, which is the OpenCyc concept for the CycL collection #$Surgery.
This emerging web of data includes data sets as extensive and diverse as DBpedia, Geonames, US Census, EuroStat, MusicBrainz, BBC Programmes, Flickr, DBLP, PubMed, UniProt, FOAF, SIOC, OpenCyc, UMBEL, Virtual Observatories, and Yago.
2004; Speer, Havasi, and Lieberman 2008) and OpenCyc / ResearchCyc, (1) and machine-learning packages such as Weka (Witten and Frank 2005).
Following a review of these and other general issues in the introductory session, the main body of the conference focused on specific ideas regarding the construction of AGI systems and preliminary results obtained by creators of present-day proto-AGI systems, including well-known systems such as SOAR and OpenCyc, as well as systems of more recent creation based on more novel approaches.
While Cyc is still far from complete, the good news is that it is complete enough that it is worth leveraging, and we have made it available at no cost for research and development purposes as ResearchCyc (courtesy of DARPA IPTO), and we have made its underlying ontology available at no cost even for commercial purposes as OpenCyc.