The noun "width" can be both countable and uncountable.
Meaning: how wide something is
Example sentence: The width of a rectangle is always shorter than its length.
Meaning: a measured piece of cloth, or the width of a swimming pool
Example sentence: How much does a width of that green silk cost?
Test your understanding:
- How many widths of the pool are you swimming?
- Do you know what the width of the swimming pool is?