hemicycle
Noun
Meaning
A half circle; a semicircle.
A semicircular place, as a semicircular arena, or room, or part of a room.
Source: Webster's dictionarySynonyms
hall
parliament
crescent
house
assembly
chamber
quadrant
plenum
court
meeting
room
floor
arc
hemisphere
plenary
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Both the Brussels and Strasbourg hemicycle roughly follow this layout with only minor differences. citation The hemicycle design is a compromise between the different Parliamentary systems.
Poland Chamber of the Sejm showing the hemicycle seating pattern.