Definition of disappointment noun from the Oxford Advanced American Dictionary

      

    disappointment

     noun
    noun
    NAmE//ˌdɪsəˈpɔɪntmənt//
     
     
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  1. 1 [uncountable] sadness because something has not happened or been as good, successful, etc. as you expected or hoped Reserve early for the show to avoid disappointment. To our great disappointment, it rained every day of the trip. He found it difficult to hide his disappointment when she didn't arrive.
  2. 2[countable] a person or thing that is disappointing a bitter/major disappointment That new restaurant was a big disappointment. He's suffered a whole string of disappointments this week. disappointment to somebody I always felt I was a disappointment to my father.
See the Oxford Advanced Learner's Dictionary entry: disappointment