IPA: /ɪnˈθjuːziæzəm/
KK: /ɪnˈθuːziˌæzəm/
A strong feeling of excitement and interest in something.
Her enthusiasm for the project inspired everyone on the team.
Enthusiasm is derived from the Greek word "enthousiasmos" (meaning divine inspiration or possession) which comes from "enthousiastein" (meaning to be inspired or possessed by a god) and "theos" (meaning god). The word reflects a state of being inspired or filled with a passionate interest or excitement.
Think of being 'inspired by a god' — that's what enthusiasm means, a strong passion or excitement about something.