ardor

noun ar·dor \ˈär-dər\

: a strong feeling of energy or eagerness

: a strong feeling of love

Full Definition of ARDOR

a : an often restless or transitory warmth of feeling <the sudden ardors of youth>

b : extreme vigor or energy : intensity

: sexual excitement

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Examples of ARDOR

the sudden ardors of youth
<candidates for citizenship reciting the oath of allegiance to the United States with all the ardor that they could muster>