What architectural feature is characterized by columns along the front and engaged columns around the other ends?

The architectural feature characterized by columns along the front and engaged columns around the other ends is known as a pseudoperipteral design. This type of layout creates the illusion of a full peripteral temple, which has free-standing columns surrounding all sides, but typically has a solid wall at the rear or the sides, making it only partially surrounded by columns.

In a pseudoperipteral structure, the use of engaged columns along the sides effectively combines the aesthetic of a colonnade with greater structural integrity, allowing for a more complex spatial arrangement. This approach can enhance the visual impact of the building and contribute to a sense of grandeur, often employed in classical architecture and neoclassical designs.

The other options do not describe this feature. Radial vaults pertain to a specific form of arch design and do not involve columns in this context. Spandrel refers to the space between the outer curve of an arch and the rectangular frame that surrounds it, which does not involve a column arrangement. Tepidarium is a term related to the heated rooms in Roman baths, not to the style of columns and their arrangement.