pavilion (n.) Look up pavilion at Dictionary.com
c.1200, "large, stately tent," from Old French paveillon "large tent; butterfly" (12c.), from Latin papilionem (nominative papilio) "butterfly, moth," in Medieval Latin "tent" (see papillon); the type of tent so called on resemblance to wings. Meaning "open building in a park, etc., used for shelter or entertainment" is attested from 1680s.