1 [uncountable and countable]
the distance from one side of something to the other [↪ breadth, length]
What's the width of the desk?
3 feet/2 metres etc in width
It's about six metres in width.
to exist from one side of something to the other:
a covered terrace extending the full width of the house
the distance from one side of a swimming pool to the other:
I swam 10 widths.
a piece of cloth that has been measured and cut
four widths of curtain material