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ardor

/ˈɑːrdər/

Intense passion, zeal, or heat

From Latin ard (to burn).

noun
ard
Latin
Verified
ardorem (nominative ardor)
a flame, fire, burning, heat; also eagerness and zeal

from Latin ardorem (nominative ardor ) "a flame, fire, burning, heat;" also of feelings, etc., "eagerness, zeal,"

Old French
Verified
ardure
heat, glow; inflammation; passion

from Old French ardure "heat, glow; inflammation; passion" (12c., Modern French ardeur )

Middle English
AI-inferred
ardour
borrowed into English with the sense of passionate heat
Modern English
Verified
ardor
retains the elevated sense of zeal, enthusiasm, or fervor

from Latin ardorem (nominative ardor ) "a flame, fire, burning, heat;" also of feelings, etc., "eagerness, zeal,"

Modern English
ardor

This one starts as literal heat, the kind that makes a forge glow and a cheek flush. Romans used ardor for flame and burning, but they also borrowed that same blazing image for eagerness and zeal, which is why the word can feel almost physical when someone has it in them. It slipped into English through Old French ardure in the 1400s, and for a while English writers used it for the rougher, baser passions before Milton helped give it a nobler shine. That’s the same old trick language loves to play: take something hot enough to scorch, then hand it over to the heart. If you know ardent, you’re already in the neighborhood—the fire never really went out, it just learned to wear a civilized face.

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