[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
Polarized lenses are ideal for the snow and water sports enthusiast.
Well, actually, a solar enthusiast can put a price on spring.
Also, keep in mind that these recordings are intended for the home movie
Scratches and pops, while charming to some, can be downright painful to a
  seasoned vinyl enthusiast.
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