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Noun: marchioness  maa(r)-shu-nus [N. Amer], 'maa(r)-shun,es [Brit]
  1. The wife or widow of a marquis
  2. A noblewoman ranking below a duchess and above a countess
    - marquise

Derived forms: marchionesses

Type of: Lady [Brit], married woman, noblewoman [Brit], peeress [Brit], wife, wifey [informal]

Encyclopedia: Marchioness