Definition of "roughness"

roughness

noun
countable and uncountable, plural roughnesses
1. The property of being rough, coarseness.
2. Something that is rough; a rough spot.
  Quotations
  A variety of suitable methods for surface inspection are available to detect topographical defects induced by surface roughnesses such as scratches, digs, inclusions and spatters.
  2003, Klaus Bange, “Surfaces of Substrate Glasses”, in Thin Films on Glass, Springer Science & Business Media, page 101
3. (US) Roughage; coarse fodder.
  Quotations
  With this latter implement, the corn stalk fodder, shucks, oats, hay and other "roughness" may be finely cut up […]
  1855, Southern Cultivator, volume 13, page 258
4. (Scotland) Abundance, especially of food.
5. (countable, engineering) A measure of how rough something is, such as a surface