We’re meeting for a picnic under the pavilion at the park.
a large structure separate from a main structure — in various senses such as:
- a large roofed structure without walls — often found in parks
- a temporary structure — such as a large tent to house exhibits at a fair, to provide sports facilities, or to put on a show
- a section of a large hospital or office complex adjacent to other parts
Much more rarely, pavilion can reference a facet of a gem or part of the outer ear.