1A person who is very interested in a particular activity or subject.
fan, fanatic, devotee, aficionado, addict, lover, admirer, supporter, followerView synonyms
- ‘a sports car enthusiast’
2archaic, derogatory A person of intense and visionary Christian views.
Mid 16th century (referring to a person believing that he or she is divinely inspired): via late Latin enthusiasta ‘kind of heretic’ from Greek enthousiastēs ‘person inspired by a god’, from enthousiazein (see enthusiasm).