from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The group of natural processes, including weathering, dissolution, abrasion, corrosion, and transportation, by which material is worn away from the earth's surface.
  • noun The process of eroding or the condition of being eroded.

from The Century Dictionary.

  • noun The act or operation of eating or gnawing away.
  • noun Hence The act of wearing away by any means.
  • noun In zoology, the abrasion or wearing away of a surface or margin, as if by gnawing; the state of being erose; the act of eroding.
  • noun In geology, the wearing away of rocks by water and other agencies of geological change.
  • noun The state of being eaten or worn away; corrosion; canker; ulceration.

from the GNU version of the Collaborative International Dictionary of English.

  • noun The act or operation of eroding or eating away.
  • noun The state of being eaten away; corrosion; canker.
  • noun The wearing away of the earth's surface by any natural process. The chief agent of erosion is running water; minor agents are glaciers, the wind, and waves breaking against the coast.
  • noun fig. a gradual reduction or lessening as if by an erosive force.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun uncountable The result of having been being worn away or eroded, as by a glacier on rock or the sea on a cliff face.
  • noun uncountable The changing of a surface by mechanical action, friction, thermal expansion contraction, or impact.
  • noun uncountable Destruction by abrasive action of fluids.
  • noun mathematics, image processing One of two fundamental operations in morphological image processing from which all other morphological operations are derived.
  • noun dentistry Loss of tooth enamel due to non-bacteriogenic chemical processes.
  • noun medicine A shallow ulceration or lesion, usually involving skin or epithelial tissue.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a gradual decline of something
  • noun erosion by chemical action
  • noun (geology) the mechanical process of wearing or grinding something down (as by particles washing over it)
  • noun condition in which the earth's surface is worn away by the action of water and wind


from The American Heritage® Dictionary of the English Language, 4th Edition

[Latin ērōsiō, ērōsiōn-, an eating away, from ērōsus, eaten away; see erose.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin erosio ("eating away"), derived from erodere, possibly via erosionem and Middle French erosion.



Log in or sign up to get involved in the conversation. It's quick and easy.

  • What is the opposite of this word?

    March 31, 2009

  • ...accretion?

    March 31, 2009