fervor

Etymology

It is inherited from Middle English fervour, also fervor,^[2][3][4] borrowed from Old French fervor, modern ferveur,^{[3][5][6][7][8]} and partly directly borrowed from Latin fervor (“a boiling, violent heat; passion, ardour”).^[9][10] The Latin noun is from ferveō (“to boil, be hot, glow”),^[3][6][4][5] which Etymonline and the American Heritage Dictionary derive from Proto-Indo-European *bhreu- (“to boil, bubble, burn”).^[6][4] It is related to fervent and fervid,^[11][7] and Barnhart refers it to the same root as brew.^[5]

Earliest recorded meaning

Warmth or glow of feeling, passion: 1340, "Fervor of thoght", in Richard Rolle's Pricke of Conscience in the OED,^[3] though the Middle English Dictionary dates that manuscript to before 1425.^[2] Barnhart's first record is the Wycliffite Bible of about 1384, which the Middle English Dictionary also has: "The feruour of loue of thin hous hath etun me".^[5][2]

Semantic evolution

The English word came in with the figurative sense of the Latin, ardour or zeal, often in religious writing such as Hilton's "feruour of loue" and "feruour of deuocion".^[2][3] The literal sense of heat followed in the 15th century, in a medical use for the heat of the body or its humours (before 1398) and for heat generally (about 1440),^[2][3] and the seething or raging of water or the sea was called its fervour until the mid-17th century.^[3][2] The Middle English Dictionary also records the sense of extreme anger.^[2] Johnson (1755) gave "heat; warmth" first,^[12] but the sense of intense heat is now rare.^[10][8]

Timeline

• 1340 – warmth or glow of feeling, passion, zeal.^[3]
• before 1398 – heat of the body or of a humour.^[2]
• c. 1440 – glowing condition, intense heat.^[3][2]
• before 1440 – of water or the sea: boiling, seething (obsolete by 1656).^[3][2]

Meanings

Noun

1. Intensity of feeling or expression; passion, ardor or zeal: She argued for the plan with great fervor.^[9][10][8]
2. Deep, excited interest in or enthusiasm for something.^[9]
3. (rare) Intense heat.^[10][9][8]

Related words

• fervent
• fervid
• effervesce
• brew

Usage notes

Fervor is the American spelling and fervour the British one.^{[9][10][13][6]} The OED enters the word as fervour, fervor and refers to favour for the choice of ending.^[3]

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j Kurath, Hans; Kuhn, Sherman M.; Lewis, Robert E., eds. (1952–2001), Middle English Dictionary, Ann Arbor: University of Michigan Press; online edition ed. Frances McSparran et al. (2000–2018)
3. ^ a b c d e f g h i j k Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
4. ^ a b c The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
5. ^ a b c d Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
6. ^ a b c d Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
7. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
8. ^ a b c d Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
9. ^ a b c d e Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
10. ^ a b c d e Collins English Dictionary (2023), Glasgow: HarperCollins
11. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
12. ^ Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
13. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House