Webster's English Dictionary

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pavilion

1. pa.vil.ion \p*-'vil-y*n\ n [ME pavilon, fr. OF paveillon, fr. L 
   papilion-, papilio] butterfly; akin to OHG fi-faltra butterfly, Lith 
   petelishachek>ke flighty 1a: a large often sumptuous tent  1b: something 
   resembling a canopy or tent  2a: a part of a building projecting from the 
   rest  2b: one of several detached or semidetached units into which a 
   building is  sometimes divided 3a: a light sometimes ornamental structure 
   in a garden, park, or place of r ecreation that is used for entertainment 
   or shelter 3b: a temporary structure erected at an exposition by an 
   individual exhibit or 4: the lower faceted part of a brilliant between the 
   girdle and the culet 
2. pavilion vt : to furnish or cover with or put in a pavilion