1. A computer-implemented method of defining a lexical database ontology comprising: accessing a lexical database comprising a plurality of concepts individually including a plurality of different words; accessing a corpus of documents; using a processor, identifying occurrences of the words in the documents of the corpus; using the processor, counting a plurality of frequency counts for the concepts, wherein the counting includes incrementing the frequency counts of the concepts using the identifying of the occurrences of the words of the respective concepts in the documents; using the processor, analyzing the frequency counts; using the processor, selecting a plurality of the concepts as event classes of a lexical database ontology using the analyzing, wherein the event classes of the lexical database ontology are usable to disambiguate textual content; and wherein each concept includes a sense of a word lemma, and wherein the counting for one of the concepts comprises incrementing the frequency count of the one concept, for each occurrence of the word lemma in the documents of the corpus which is included in the one concept, by 1/n where n is the total number of concepts which include a sense of the world lemma.