A semicircular place, as a semicircular arena, or room, or part of a room. "The collections will be displayed in the hemicycle of the central pavilion."
... the members of the Viceroy's Legislative Council used to gather, with far less of formality, had disappeared, and the 59 members of the enlarged Council had their appointed seats disposed in a double hemicycle facing the Chair. They sat for the most part according to provinces, and the features as well as, in some cases, the dresses, of the Indian members showed at a glance how representative ... — Indian Unrest • Valentine Chirol
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