What is defined as a structure that is fabricated off-site for installation at the building site?

The term that describes a structure fabricated off-site for subsequent installation at the building site is "Modular." This term refers specifically to construction methods where individual sections of a building, known as modules, are pre-built in a factory setting. These modules are then transported to the construction site and assembled to form a complete building. This approach is efficient, reduces waste, and can significantly shorten the construction timeline.

The context in which the other choices might be used can help clarify why "Modular" is the most suitable answer. A pre-fabricated structure could fit the description as it also refers to building elements made off-site, but "Modular" more specifically encompasses the entire method of construction that involves completed sections. A temporary structure is not relevant here, as it implies a building designed for short-term use rather than a permanent installation. Construction module, while it might seem similar to modular, typically refers to a single unit rather than the broader concept of modular construction.