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A lexicon is a word list with information about the words. I.e. it is a source of lexical information. Dictionaries and things like dictionaries are lexicons. in computational linguistics some examples include

  • Polarity lexicons: words tagged with positive or negative sentiment values. some writing about this in Velikovich_et_al,_NAACL_2010.
  • Thesaurses
  • WordNet-style lexicons: synonym and hypernym relations between words
  • Concept-ish knowledge bases: maybe lexicons are a special case of this. RTW KB and Cyc are examples.