Source : Webster's Revised Unabridged Dictionary (1913)

Pavilion \Pa*vil"ion\, n. [F. pavillon, fr. L. pavilio a
   butterfly, also, a tent, because spread out like a
   butterfly's wings.]
   1. A temporary movable habitation; a large tent; a marquee;
      esp., a tent raised on posts. ``[The] Greeks do pitch
      their brave pavilions.'' --Shak.

   2. (Arch.) A single body or mass of building, contained
      within simple walls and a single roof, whether insulated,
      as in the park or garden of a larger edifice, or united
      with other parts, and forming an angle or central feature
      of a large pile.

   3. (Mil.) A flag, colors, ensign, or banner.

   4. (Her.) Same as {Tent} (Her.)

   5. That part of a brilliant which lies between the girdle and
      collet. See Illust. of {Brilliant}.

   6. (Anat.) The auricle of the ear; also, the fimbriated
      extremity of the Fallopian tube.

   7. A covering; a canopy; figuratively, the sky.

            The pavilion of heaven is bare.       --Shelley.

Pavilion \Pa*vil"ion\, v. t. [imp. & p. p. {Pavilioned}; p. pr.
   & vb. n. {Pavilioning}.]
   To furnish or cover with, or shelter in, a tent or tents.

         The field pavilioned with his guardians bright.
                                                  --Milton.

Source : WordNet®

pavilion
     n : large and often sumptuous tent [syn: {marquee}]