Definition of enthusiasm noun from the Oxford Advanced Learner's Dictionary
enthusiasm
noun
ɪnˈθjuːziæzəm ɪnˈθuːziæzəm
1[uncountable]a strong feeling of excitement and interest in something and a desire to become involved in itenthusiasm (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 enthusiasm2[countable] (formal) something that you are very interested in and spend a lot of time doingReading is one of her many enthusiasms.
ɪnˈθjuːziæzəm 
ɪnˈθuːziæzəm 
1 [uncountable] a strong feeling of excitement and interest in something and a desire to become involved in itenthusiasm (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 enthusiasm2 [countable] (formal) something that you are very interested in and spend a lot of time doingReading is one of her many enthusiasms.