ardor

(noun) a feeling of strong eagerness (usually in favor of a person or cause). Synonyms: ardour, elan, zeal. Examples: "They were imbued with a revolutionary ardor." "He felt a kind of religious zeal."

(noun) intense feeling of love. Synonyms: ardour.

(noun) feelings of great warmth and intensity. Synonyms: ardour, fervor, fervour, fervency, fire, fervidness. Examples: "He spoke with great ardor."