'ardor' definitions:

Definition of 'ardor'

From: WordNet
A feeling of strong eagerness (usually in favor of a person or cause); "they were imbued with a revolutionary ardor"; "he felt a kind of religious zeal" [syn: ardor, ardour, elan, zeal]
Intense feeling of love [syn: ardor, ardour]
Feelings of great warmth and intensity; "he spoke with great ardor" [syn: ardor, ardour, fervor, fervour, fervency, fire, fervidness]

Synonyms of 'ardor'

From: Moby Thesaurus