What is a building part of a basilica that is perpendicular to the nave also called?
Transept. the arm of a cruciform church, perpendicular to the nave; the point where the nave and transept cross is called the crossing. Clerestory.
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Between the nave and the apse, they added a transept , which ran perpendicular to the nave. This addition gave the building a cruciform shape to memorialize the Crucifixion.
Although their form was variable, basilicas often contained interior colonnades that divided the space, giving aisles or arcaded spaces on one or both sides, with an apse at one end (or less often at each end), where the magistrates sat, often on a slightly raised dais.
The nave wall is divided into three stages: the upper stage with windows is the clerestory, beneath it is the triforium, and the lowest stage is the arcade.