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The noun "width" can be both countable and uncountable.

width → uncountable

Meaning: how wide something is

Example sentence: The width of a rectangle is always shorter than its length.

width → countable

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?

Quick Quiz:

In which sentence is the word "width" uncountable?

a. How many widths of the pool are you swimming?

b. Do you know what the width of the swimming pool is?

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Contributor: Matt Errey