Final answer:
The ambulatory is the specific term for an aisle that wraps around the end of the choir or chancel in a church, allowing for movement around the sacred space. The nave is the central part of the church, the apse is an often-rounded end of the nave, and the transept crosses the nave form, giving the church a cross-shaped layout.
Step-by-step explanation:
The aisle that encircles the end of the choir or chancel of a church is known as the ambulatory. This is a passage that allows movement around the sacred space, designed for the flow of pilgrims or processionals. The nave is the central part of the church extending from the entrance to the altar, often ending with the apse. The transept is an area that cuts across the nave and aisles, giving the church a cross-shaped form.
From historical examples, we can see that the layout of these architectural elements plays a significant role in the function and symbolism of the church's interior. For instance, in pilgrimage churches, the double aisles beside the nave and the ambulatory around the apse allowed pilgrims to circulate freely, partaking in their spiritual journey without disrupting ongoing religious services.
The terms provided in the question represent specific elements contributing to the complexity and functionality of church architecture. Churches like San Vitale in Ravenna with central plans challenged the traditional basilica form and employed the ambulatory as a defining feature for liturgical movements.