An open circular or oval building with a central space for the presentation of dramatic or sporting events surrounded by tiers of seats for spectators.

The ancient Romans built the Colosseum as a grand amphitheater for gladiatorial contests and public spectacles.

A sloping, semicircular seating gallery in a theater.

The concert was held in the amphitheater, where the acoustics allowed the music to be heard clearly by everyone.

A natural formation resembling an amphitheater, especially a level area surrounded by steep slopes.

The hikers reached a stunning amphitheater in the mountains, where the cliffs formed a perfect circle around a grassy meadow.

amphitheateradjective

Relating to, characteristic of, or suitable for an amphitheater.

The festival will take place on the newly constructed amphitheater stage.