from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Great warmth and intensity of emotion. See Synonyms at passion.
  • n. Intense heat.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An intense, heated emotion; passion, ardor.
  • n. A passionate enthusiasm for some cause.
  • n. Heat.

from the GNU version of the Collaborative International Dictionary of English

  • n. Heat; excessive warmth.
  • n. Intensity of feeling or expression; glowing ardor; passion; holy zeal; earnestness.

from The Century Dictionary and Cyclopedia

  • n. Heat or warmth.
  • n. Warmth of feeling; ardor; impassioned earnestness: as, the fervor of enthusiasm.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the state of being emotionally aroused and worked up
  • n. feelings of great warmth and intensity


Middle English fervour, from Old French, from Latin fervor, from fervēre, to boil; see bhreu- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English, from Old French, from Latin fervor ("a boiling or raging heat, heat, vehemence, passion"), from fervere ("to boil, be hot"); see fervent. (Wiktionary)



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