Both Uses

pavilion
in
War and Peace
(Auto-generated)

He saw the raft, decorated with monograms, saw Napoleon pass before the French Guards on the farther bank of the river, saw the pensive face of the Emperor Alexander as he sat in silence in a tavern on the bank of the Niemen awaiting Napoleon's arrival, saw both Emperors get into boats, and saw how Napoleon—reaching the raft first—stepped quickly forward to meet Alexander and held out his hand to him, and how they both retired into the pavilion.†
Chpt 5

pavilion = a large structure separate from a main structure or temporary
At the moment the Emperors went into the pavilion he looked at his watch, and did not forget to look at it again when Alexander came out.†
Chpt 5 *

Definitions:

(1) (pavilion)
a large building or section of a building that stands apart in function or design -- often used for gatherings, exhibitions, or specialized purposes
(2) (meaning too rare to warrant focus)
Much more rarely, pavilion can reference a facet of a gem or part of the outer ear.