Final answer:
Composite construction refers to buildings that combine multiple construction types or do not fit into any specific type.
Step-by-step explanation:
A composite construction refers to a building that is a mix of multiple NFPA 220 construction types or one that doesn't fit into any of the five construction types. It combines different elements and materials to create a unique structure. For example, a building might have a steel frame with concrete floors or a combination of wood and brick walls.