幅度 (fúdù) is a noun meaning 'range', 'extent', or 'amplitude'—referring to the size or scope of a change, difference, or variation. The first character 幅 (fú) originally meant 'width' or 'breadth' (as in the width of a scroll or fabric), while 度 (dù) means 'degree', 'measure', or 'scale'. Together, they convey the idea of measurable scope: how far something extends, rises, falls, or differs from a baseline.

This word is commonly used in formal, technical, and everyday contexts involving quantifiable change—such as economic growth rates, temperature fluctuations, price adjustments, or performance improvements. It often appears after verbs like 'increase', 'decrease', 'expand', or 'narrow', and frequently co-occurs with measure words like 'a large/small/noticeable' or adverbs like 'significantly' or 'slightly'. While abstract, it always implies a measurable interval between two points on a scale.