The distance or measurement from side to side of something; width. The breadth of the river made it difficult to build a bridge across it.
The breadth of her knowledge on the subject impressed everyone at the conference.
A piece of fabric of standard or full width. The tailor needed a breadth of cloth to complete the dress.
A very small distance or margin; a hair's breadth. The climber missed falling to his death by a hair's breadth.