Definition of dictionary noun from the Oxford Advanced Learner's Dictionary

      

    dictionary

     noun
    noun
    BrE BrE//ˈdɪkʃənri//
     
    ; NAmE NAmE//ˈdɪkʃəneri//
     
    (pl. dictionaries)
     
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  1. 1  a 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 Wordfinderalphabetical, definition, dictionary, entry, example, headword, meaning, part of speech, pronunciation, register
  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 spellchecker
  4. Wordfinderconnotation, definition, dictionary, homonym, meaning, pronunciation, spelling, synonym, vocabulary, word Word Origin early 16th cent.: from medieval Latin dictionarium (manuale) or dictionarius (liber) ‘manual or book of words’, from Latin dictio, from dicere ‘to say’.Extra examples I couldn’t find the word in the dictionary. I decided to consult a medical dictionary. If you don’t know the meaning of a word, look it up in the dictionary. You need a dictionary to understand what he’s saying half the time. a way of teaching children how to use dictionaries
See the Oxford Advanced American Dictionary entry: dictionary