This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Fiery intensity of feeling. See Synonyms at passion.

n. Strong enthusiasm or devotion; zeal: "The dazzling conquest of Mexico gave a new impulse to the ardor of discovery” ( William Hickling Prescott).

n. Intense heat or glow, as of fire.

n. Great warmth of feeling; fervor; passion.

n. Spirit.

n.  Intense heat.

n. Heat, in a literal sense.

n. Warmth or heat of passion or affection; eagerness; zeal

n. Bright and effulgent spirits; seraphim.

n. Intense heat: as, the ardor of the sun's rays.

n. In pathology, a feeling of heat or burning.

n. A bright or effulgent spirit.

n. Warmth or heat, as of the passions and affections; eagerness; intensity.

n. Synonyms Fervor, fervency, vehemence, intensity, impetuosity.

n. intense feeling of love

n. a feeling of strong eagerness (usually in favor of a person or cause)

n. feelings of great warmth and intensity

"In both, they seem to compete with us, and in ardor and activity they even surpass most of our savans."

apathy    indifference   

love    keenness    avidity    eagerness    avidness   

fervor    warmth    eagerness    zeal    seraphim    impetuosity    ardency    fever    feverishness    heat   

carder    harder    larder    marder    yarder   

ardour    fervor    earnestness    zeal    eagerness    vehemence    vigour    perseverance    devotion    zest