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

  • n. The process of eroding or the condition of being eroded: erosion of the beach; progressive erosion of confidence in our legal system; erosion of the value of the dollar abroad.
  • n. The group of natural processes, including weathering, dissolution, abrasion, corrosion, and transportation, by which material is worn away from the earth's surface.

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

  • n. The act or operation of eroding or eating away.
  • n. The state of being eaten away; corrosion; canker.
  • n. 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.
  • n. a gradual reduction or lessening as if by an erosive force.

from The Century Dictionary and Cyclopedia

  • n. The act or operation of eating or gnawing away.
  • n. Hence The act of wearing away by any means.
  • n. 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.
  • n. In geology, the wearing away of rocks by water and other agencies of geological change.
  • n. The state of being eaten or worn away; corrosion; canker; ulceration.

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

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


Latin ērōsiō, ērōsiōn-, an eating away, from ērōsus, eaten away; see erose.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin erosio ("eating away"), derived from erodere, possibly via erosionem and Middle French erosion. (Wiktionary)



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