The Collaborative International Dictionary of English v.0.48:

Marquee \Mar*quee"\, n. [F. marquise, misunderstood as a plural;
   prob. orig., tent of the marchioness. See Marquis.]
   A large field tent; esp., one adapted to the use of an
   officer of high rank. [Written also markee.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

marquee
    n 1: large and often sumptuous tent [syn: pavilion, marquee]
    2: permanent canopy over an entrance of a hotel etc. [syn:
       marquee, marquise]