The Collaborative International Dictionary of English v.0.48:

lycee \lycee\, Lyc'ee \Ly`c['e]e"\, n. [F. Cf. Lyceum.]
   A French lyceum, or secondary school for students
   intermediate between elementary school and college, supported
   by the French government, for preparing students for the
   university.

   Syn: secondary school, lyceum, Gymnasium, middle school.
        [Webster 1913 Suppl. + WordNet 1.5]

WordNet (r) 3.0 (2006):

lycee
    n 1: a school for students intermediate between elementary
         school and college; usually grades 9 to 12 [syn: secondary
         school, lyceum, lycee, Gymnasium, middle school]