Definition of ardor
1a
: an often restless or transitory warmth of feeling
the sudden ardors of youth
b
: extreme vigor or energy : intensity
the ardor of a true believer
c
: zeal
d
: loyalty
2
: sexual excitement
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Merriam-Webster unabridged
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Time Traveler for ardor
The first known use of ardor was in the 14th century
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