Etymology
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amphitheater (n.)

late 14c., "ancient Roman edifice for the exhibition of games, etc.," from Latin amphitheatrum, from Greek amphitheatron "double theater, amphitheater," neuter of amphitheatros "with spectators all around," from amphi "on both sides" (from PIE root *ambhi- "around") + theatron "theater" (see theater). Classical theaters were semi-circles, thus two together made an amphi-theater. They were used by the Romans especially for gladiatorial contests and combats of wild beasts.

updated on September 20, 2022

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Definitions of amphitheater from WordNet

amphitheater (n.)
a sloping gallery with seats for spectators (as in an operating room or theater);
Synonyms: amphitheatre
amphitheater (n.)
an oval large stadium with tiers of seats; an arena in which contests and spectacles are held;
Synonyms: amphitheatre / coliseum
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.