1. Passage, colonnade, portico, or other outdoor element, often fitted with seats, or where debate and conversation could occur.
2. Large semicircular niche-like building with stone seats ranged around the walls, sometimes with a hemidome over, resembling a large apse, often arranged on an axis related to a larger space.
3. Semicircular low wall with seats on the concave side so that the wall acts as the seatbacks.
4. Place in a garden partially enclosed by a semicircular hedge, walls, etc.
"exedra." A Dictionary of Architecture and Landscape Architecture. . Encyclopedia.com. (August 19, 2018). http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/exedra
"exedra." A Dictionary of Architecture and Landscape Architecture. . Retrieved August 19, 2018 from Encyclopedia.com: http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/exedra