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width
This term describes a spatial dimension that is perpendicular to length. It carries a neutral, technical tone and is most frequently used in construction, tailoring, and geometry to define the physical boundaries of an object. In a broader sense, the word can describe the range or scope of a topic or a person's knowledge. When used this way, it suggests a horizontal expansion of coverage rather than a deep, vertical dive into a single subject.
Countable when referring to a specific measurement or a variety of different sizes (e.g., the widths of the various beams). Uncountable when referring to the general concept of measurement (e.g., width is the second dimension).