From Ancient Greek ἐνθουσιαστής, from ἐνθουσιάζειν: see enthusiasm.

• (America, Canada) IPA: /ɪnˈθu.ziˌɪst/, /ɛn-/, /-ˈθju-/, /-ˌæst/, /-əst/
• (RP, IE) IPA: /ɪnˈθuː.ziˌæst/, /-θjuː-/, /-əst/
• (Australia, New Zealand) IPA: /ɪ̞nˈθʊʉ.ziˌəst/, /en-/, /-θïɯ-/, /-æst/

enthusiast (plural enthusiasts)

1. A person filled with or guided by enthusiasm.

   Synonyms: aficionado, amateur, freak, power user, prosumer, Thesaurus:enthusiast

   • 1834, L[etitia] E[lizabeth] L[andon], chapter IV, in Francesca Carrara. […], volume III, London: Richard Bentley, […], (successor to Henry Colburn), →OCLC ↗, page 28 ↗:

     But Charles Aubyn (for it was he) had, like most enthusiasts, overcalculated the influence of his eloquence; surprise had alone procured him a hearing, and the bold cavaliers around were little in the mood for a homily.

2. (archaic) A person exhibiting over-zealous religious fervour.

• French: passionné, amateur
• German: Enthusiast
• Italian: entusiasta, appassionato
• Portuguese: entusiasta
• Russian: энтузиа́ст
• Spanish: entusiasta

• French: enthousiaste, zélote
• Italian: zelota