Etymology
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ardor (n.)

"heat of passion or desire," mid-15c., from Old French ardure "heat, glow; inflammation; passion" (12c., Modern French ardeur), from Latin ardorem (nominative ardor) "a flame, fire, burning, heat;" also of feelings, etc., "eagerness, zeal," from ardere "to burn," from PIE root *as- "to burn, glow." In Middle English used of base passions; since Milton's time of noble ones.

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Definitions of ardor

ardor (n.)
a feeling of strong eagerness (usually in favor of a person or cause);
they were imbued with a revolutionary ardor
Synonyms: ardour / elan / zeal
ardor (n.)
intense feeling of love;
Synonyms: ardour
ardor (n.)
feelings of great warmth and intensity;
he spoke with great ardor
Synonyms: ardour / fervor / fervour / fervency / fire / fervidness
From wordnet.princeton.edu