fitment

This term is most frequently encountered in technical, industrial, or interior design contexts, particularly in British English. When referring to physical objects, it describes permanent or semi-permanent fixtures, such as cabinetry in a kitchen or specialized components in a vehicle, distinguishing them from freestanding furniture.

In a mechanical or engineering context, the word shifts from describing an object to describing the precision of a process. It refers to the exactness with which two parts join together, where a poor fitment can lead to mechanical failure or inefficiency.