[en-thoo-zee-ast, -ist]
a person who is filled with enthusiasm for some principle, pursuit, etc.; a person of ardent zeal: a sports enthusiast.
a religious visionary or fanatic.

1600–10; < Greek enthousiastḗs one inspired, equivalent to enthousi- (see enthusiasm) + -astēs, variant of -istēs -ist after i

antienthusiast, noun

1. zealot, devotee, fan.
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World English Dictionary
enthusiast (ɪnˈθjuːzɪˌæst)
1.  a person filled with or motivated by enthusiasm; fanatic
2.  archaic a religious visionary, esp one whose zeal for religion is extravagant or unbalanced

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1600, pejorative, one who believes himself possessed of divine revelations or special communication from God, from Gk. enthousiastes, from enthousiazein (see enthusiasm). General sense (not always entirely pejorative) is from mid-18c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Even for online- learning enthusiasts, broadly held negative perceptions can
  have an influence.
We are also certainly tortoise enthusiasts but not certified tortoise experts.
The truest alcohol enthusiasts will try almost anything to conjure the
  libations of old.
He's part of an unusual band of enthusiasts known as wreck chasers, although he
  doesn't care much for the term.
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