The term "height adjustment" refers to the process or mechanism by which something is altered in terms of its height, size, or elevation. This can be applied to a wide range of objects and situations, from furniture such as chairs or beds, to buildings or structures like walls or fences, to vehicles like cars or trucks. The specific meaning will depend on the context in which it is used. In general, height adjustment refers to making something taller or shorter by adding or removing material, using mechanical devices or tools, or through other means such as levers or pulleys.