manufactured in advance in standard sections that are easy to ship and assemble when and where needed

manufactured in standard sizes to be shipped and assembled elsewhere; "a prefabricated structure"

Constructed in standard sections that can be easily shipped and assembled.

is a term to categorize a variety of manufacturing techniques. Prefabricated or prefab comprise: modular, mobile, panelized and pre-cut kit houses. They have come a long way since the inception of the first mobile home. An analogy can be made in comparing the mobile home to the technological advances of computer technology: compare the function of a 10-year-old computer to a new one.

Purchased part on which some fabrication has been performed.