attrition

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attrition

noun decrease, disintegration, dwindling, erosion, fading, falling off, lessening, waning, wearing away
See also: erosion
References in classic literature ?
On the other hand, I do not believe that any line of coast, ten or twenty miles in length, ever suffers degradation at the same time along its whole indented length; and we must remember that almost all strata contain harder layers or nodules, which from long resisting attrition form a breakwater at the base.
John's river, some quartz crystals with their edges blunted from attrition, and mixed with gravel on the sea-beach.
These entire classes were eliminated from the analysis, including those in that group who had already attrited, leaving 40 students with undefined outcomes or with attritions categorized as "other.