'enthusiast' originates from Greek, specifically the word 'enthousiastēs,' where 'en-' meant 'in' and 'theos' meant 'god.'

'enthousiastēs' transformed into the Latin word 'enthusiasta,' and eventually became the modern English word 'enthusiast' through Middle English.

Initially, it meant 'a person inspired by a god,' but over time it evolved into its current meaning of 'a person who is highly interested in a particular activity or subject.'