Merriam-Webster Collegiate Dictionary - pavilion

 I. noun  Etymology: Middle English pavilloun, pavillioun, from Anglo-French, from Latin papilion-, papilio butterfly; perhaps akin to Old High German fifaltra butterfly  Date: 13th century  1.  a. a large often sumptuous tent  b. something resembling a canopy or tent tree ferns spread their delicate ~s — Blanche E. Baughan  2.  a. a part of a building projecting from the rest  b. one of several detached or semidetached units into which a building is sometimes divided  3.  a. a usually open sometimes ornamental structure in a garden, park, or place of recreation that is used for entertainment or shelter  b. a temporary structure erected at an exposition by an individual exhibitor  4. the lower faceted part of a brilliant below the girdle — see brilliant illustration  II. transitive verb  Date: 14th century to furnish or cover with or put in a ~