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Concept lattice

A concept lattice is a mathematical structure that may be used to model an ontology (computer science).

It is an n-dimensional lattice, where each dimension describes a true-or-false answer to an axiomatic proposition, e.g.: "the sun will come up tomorrow", or "I am a mortal being".

See:

http://www.infosun.fmi.uni-passau.de/st/papers/tr-95-09/
http://www.ontologos.org/IFF/OntologyOntology/Introduction.htm

Also related:

Concept map[?]
http://cmap.coginst.uwf.edu/info/

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