Amphitheater (noun)

An open-air structure with tiers of seats on sloping banks, used for sports events, concerts, and other performances.

Origin:

Early 17th century: via latin from greek amphitheatron "place for viewing both sides", from amphi- "on both sides" + theatron "place of viewing".

Examples:

1. The ancient Roman amphitheater was used for gladiatorial contests.
2. The city's new amphitheater was built for concerts and shows.
3. The seating capacity of the amphitheater was over 10,000 people.
4. The band performed at an outdoor amphitheater.
5. The amphitheater was built with a stage in the center.