What is another word for "amphitheater"?

Roget's Thesaurus (1911) lists these synonyms for "amphitheater": abecedary, academic, academy, action, alma, ambo, and, arena, art, auditorium, battle, bear, boarding, book, box, boxing, camp, campus, canvas, cathedra, chair, circus, class, cockpit, college, collegiate, continuation, convent, course, creche, cyclopedia, day, denominational, desk, dictionary, educational, encyclopedia, fellowship, field, forum.