an ardent and enthusiastic supporter of some person or activity
"The local cycling enthusiast organized a charity ride to raise money for the community center."
a person having a strong liking for something
"My neighbor is an avid bird enthusiast who spends every morning listening to their songs from his porch."
A person filled with or guided by enthusiasm.
"The enthusiastic collector studied every detail of the rare stamps, driven entirely by his passion for philately."
In plain English: An enthusiast is someone who really loves and spends a lot of time doing something specific.
"Sarah is an avid photography enthusiast who always carries her camera with her."
Usage: Use this term to describe someone who actively pursues a specific hobby, such as an automotive enthusiast or fitness enthusiast. It implies genuine passion and regular engagement rather than casual interest.
From Ancient Greek ἐνθουσιαστής (enthousiastḗs, "an enthusiast, a zealot"), from ἐνθουσιάζειν (enthousiázein, "(intransitive) be inspired or possessed by a god, be rapt, be in ecstasy, (transitive) inspire"): see enthusiasm.