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erosion (n.)

1540s, from French erosion (16c.), from Latin erosionem (nominative erosio) "a gnawing away," noun of action from past-participle stem of erodere "to gnaw away, consume," from assimilated form of ex "away" (see ex-) + rodere "to gnaw" (possibly from an extended form of PIE root *red- "to scrape, scratch, gnaw"). Related: Erosional.

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Definitions of erosion from WordNet

erosion (n.)
(geology) the mechanical process of wearing or grinding something down (as by particles washing over it);
Synonyms: eroding / eating away / wearing / wearing away
erosion (n.)
condition in which the earth's surface is worn away by the action of water and wind;
erosion (n.)
a gradual decline of something;
after the accounting scandal there was an erosion of confidence in the auditors
erosion (n.)
erosion by chemical action;
Synonyms: corrosion / corroding
From wordnet.princeton.edu