Definition of enthusiasm noun from the Oxford Advanced American Dictionary

      

    enthusiasm

     noun
    noun
    NAmE//ɪnˈθuziˌæzəm//
     
     
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  1. 1[uncountable] a strong feeling of excitement and interest in something, and a desire to become involved in it enthusiasm (for something) I can't say I share your enthusiasm for the idea. He had a real enthusiasm for the work. enthusiasm (for doing something) She never lost her enthusiasm for teaching. The news was greeted with a lack of enthusiasm by those at the meeting. “I don't mind,” she said, without much enthusiasm. full of enthusiasm Wet weather did not dampen the enthusiasm of the participants in the event.
  2. 2[countable] (formal) something that you are very interested in and spend a lot of time doing Reading is one of her many enthusiasms.
See the Oxford Advanced Learner's Dictionary entry: enthusiasm