- great warmth of feeling; fervor; passion: She spoke persuasively and with ardor.
- intense devotion, eagerness, or enthusiasm; zeal: his well-known ardor for Chinese art.
- burning heat.
- feelings of great intensity and warmth; fervour
- eagerness; zeal
chiefly British English spelling of(q.v.); for spelling, see .
early 15c., “heat of passion or desire,” from Old French ardure “heat, glow; passion” (12c.), from Latin ardorem (nominative ardor) “a flame, fire, burning, heat;” also of feelings, etc., “eagerness, zeal,” from ardere “to burn” (see ). In Middle English, used of base passions; since Milton’s time, of noble ones.