'Marchioness' definitions:

Definition of 'marchioness'

From: WordNet
noun
The wife or widow of a marquis
noun
A noblewoman ranking below a duchess and above a countess [syn: marchioness, marquise]

Definition of 'Marchioness'

From: GCIDE
  • Marchioness \Mar"chion*ess\, n. [LL. marchionissa, fr. marchio a marquis. See Marquis.] The wife or the widow of a marquis; a woman who has the rank and dignity of a marquis. --Spelman. [1913 Webster]