1. Space in a vaulted chamber for sepulchral purposes, e.g. arcosolium or loculus.
2. Excavation before the basement-walls of a building.
3. Mortuary-chest, shrine, pyx, or receptacle for relics.
4. Prison or secure chamber.
5. Caisson for building bridges.
6. Roof-beam with a groove running its length.
"arca, archa." A Dictionary of Architecture and Landscape Architecture. . Encyclopedia.com. (December 12, 2018). https://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/arca-archa
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