great warmth of feeling; fervor; passion: She spoke persuasively and with ardor.
intense devotion, eagerness, or enthusiasm; zeal: his well-known ardor for Chinese art.
burning heat.
Also, especially British, ardour.

1350–1400; Middle English < Latin, equivalent to ārd(ēre) to burn + -or -or1; replacing Middle English ardure < Old French ardur < Latin, as above; 17th century ardour < Anglo-French < Latin, as above

1. fervency, spirit, earnestness, intensity. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ardour or (US) ardor (ˈɑːdə)
1.  feelings of great intensity and warmth; fervour
2.  eagerness; zeal
[C14: from Old French ardour, from Latin ārdor, from ārdēre to burn]
ardor or (US) ardor
[C14: from Old French ardour, from Latin ārdor, from ārdēre to burn]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., "heat of passion or desire," from O.Fr. ardour (12c.), from L. ardorem (nom. ardor) "a flame, fire," from ardere "to burn" (see ardent). In M.E., used of base passions; since Milton's time, of noble ones.

British spelling of ardor (q.v.); for suffix, see -or.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The troops were pressing forward with all the ardour and enthusiasm of combat.
She accedes to the proposal with nearly as much ardour as.
Such was his ardour and affection for this heavenly exercise, that he seemed to
  pray everywhere, and at all times.
He threw into the effort all the ardour of a generous and enthusiastic nature.
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