Definition of enthusiasm
1a
: strong excitement of feeling : ardor
did her work with energy and enthusiasm
b
: something inspiring zeal or fervor
his enthusiasms include sailing and fishing
2a
: belief in special revelations of the Holy Spirit
b
: religious fanaticism
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Merriam-Webster unabridged
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Time Traveler for enthusiasm
The first known use of enthusiasm was in 1595
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