Definition of "enthusiast" []

• One who is filled with enthusiasm; one who is ardently absorbed in an interest or pursuit: a baseball enthusiast. (noun)
• A zealot; a fanatic. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Model train enthusiast David K. Smith has built a miniscule train layout which works – the train travels in an ellipse, including through a “mountain.”"
• "The latest enthusiast is the German insurance company Munich Re."
• "Much efforts and money were invested in this colorful and technologically advanced production at the Adelphi Theatre in London's West End. Yet, even an amateur musical enthusiast is hard-pressed to understand what justified the show."