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.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
She was speaking from ardor as much as from ego.
So I won't be surprised by the lack of ardor over his accomplishment.
Still, there's no doubting the ardor of their connection.
But Tom's ardor soon cools when he meets a young aspiring actress.
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