Definition of "abrasion"

The act of abrading, wearing, or rubbing off; the wearing away by friction.  examples

(obsolete) The substance thus rubbed off; debris.

(geology) The effect of mechanical erosion of rock, especially a river bed, by rock fragments scratching and scraping it.

An abraded, scraped, or worn area.  examples

(medicine) A superficial wound caused by scraping; an area of skin where the cells on the surface have been scraped or worn away.  examples

(dentistry) The wearing away of the surface of the tooth by chewing.  examples