Definition of dictionary noun from the Oxford Advanced American Dictionary

      

    dictionary

     noun
    noun
    NAmE//ˈdɪkʃəˌnɛri//
     
    (pl. dictionaries)
     
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  1. 1a book that gives a list of the words of a language in alphabetical order and explains what they mean, or gives a word for them in a foreign language a Spanish-English dictionary
  2. 2a book that explains the words that are used in a particular subject a dictionary of mathematics
  3. 3a list of words in electronic form, for example stored in a computer's spell-checker
See the Oxford Advanced Learner's Dictionary entry: dictionary