#dictionary__lexicon  a reference book containing an alphabetical list of words with information about them
  supertype:  #wordbook  a reference book containing words (usually with their meanings)
  part:  #lexical_entry
  subtype:  #bilingual_dictionary__bilingualdictionary  a dictionary giving equivalent words in two languages
  subtype:  #desk_dictionary__deskdictionary__collegiate_dictionary  an abridged dictionary of a size convenient to hold in the hand
  subtype:  #etymological_dictionary  a dictionary giving the historical origins of each word
  subtype:  #gazetteer  a geographical dictionary (as at the back of an atlas)
  subtype:  #learner's_dictionary__learner'sdictionary__schooldictionary  a dictionary specially written for those learning a foreign language
  subtype:  #pocket_dictionary__little_dictionary  a dictionary that is small enough to carry in your pocket
  subtype:  #spell-checker__spellchecker__spelling_checker  an electronic dictionary in a word processor that can be used to catch misspelled words
  subtype:  #unabridged_dictionary  a dictionary that is claimed to be complete
     subtype:  #Oxford_English_Dictionary__O.E.D.__OED  an unabridged dictionary constructed on historical principles

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