Etymology
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fervor (n.)

mid-14c., "warmth or glow of feeling," from Old French fervor "heat; enthusiasm, ardor, passion" (12c., Modern French ferveur), from Latin fervor "a boiling, violent heat; passion, ardor, fury," from fervere "to boil; be hot" (from PIE root *bhreu- "to boil, bubble, effervesce, burn").

updated on May 29, 2017

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Definitions of fervor from WordNet

fervor (n.)
feelings of great warmth and intensity;
Synonyms: ardor / ardour / fervour / fervency / fire / fervidness
fervor (n.)
the state of being emotionally aroused and worked up;
From wordnet.princeton.edu, not affiliated with etymonline.