• (RP) IPA: /ˈɑːdə/, /ˈɑː(ɹ)də(ɹ)/
• (America) IPA: /ˈɑːɹdəɹ/

ardor (American spelling)

1. Great warmth of feeling; fervor; passion.
   • 1818, [Mary Shelley], chapter VI, in Frankenstein; or, The Modern Prometheus. In Three Volumes, volume III, London: Printed [by Macdonald and Son] for Lackington, Hughes, Harding, Mavor, & Jones, OCLC 830979744 ↗, [https://babel.hathitrust.org/cgi/pt?id=emu.010001278703;view=1up;seq=128 page 120]:

     I rushed towards her, and embraced her with ardour; but the deathly languor and coldness of the limbs told me, that what I now held in my arms had ceased to be the Elizabeth whom I had loved and cherished.

2. Spirit; enthusiasm; passion.
3. Intense heat.

• (warmth of feeling) intensity
• (spirit) elan, fire in the belly, passion, zeal

• apathy

• French: ardeur, ferveur
• German: Begeisterung, Feuereifer, Hitze, Überschwang
• Italian: ardore, fervore
• Portuguese: ardor
• Russian: пыл
• Spanish: fervor, ardor

• Portuguese: ardor
• Russian: страсть
• Spanish: pasión

• French: ardeur
• Portuguese: ardor
• Russian: жара́
• Spanish: ardor