What are the differences between a vocabulary, a taxonomy, a thesaurus, an ontology, and a meta-model?

http://www.newsisfree.com/click/-4,14534085,2572/

A very useful explanation that has some good links in the ensuing discusions (cf “A Framework for Understanding and Classifying Ontology Applications“) and was also interesting to me for highlighting this site, metamodel.com. – SWL

– via [elearningpost]

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What are the differences between a vocabulary, a taxonomy, a thesaurus, an ontology, and a meta-model?