The Collaborative International Dictionary of English v.0.48:

Marquise \Mar`quise"\, n. [F. See Marquis, and cf. Marquee.]
   The wife of a marquis; a marchioness.
   [1913 Webster]

WordNet (r) 3.0 (2006):

marquise
    n 1: a noblewoman ranking below a duchess and above a countess
         [syn: marchioness, marquise]
    2: permanent canopy over an entrance of a hotel etc. [syn:
       marquee, marquise]