1. (n.) The act or operation of eroding or eating away.

2. (n.) The state of being eaten away; corrosion; canker.

ablation abrading abrasion abrasive absorption abstraction assimilation atomization attrition breakup buffing burning up burnishing chafe chafing consumption corroding corrosion crumbling decay decomposition decrease decrement deduction degradation deliquescence depletion depreciation detrition digestion dilapidation disintegration disjunction disorganization dissipation dissolution drain dressing eating up erasure evaporation exhaustion expending expenditure filing finishing fraying fretting galling grazing grinding impoverishment incoherence ingestion leakage limation loss polishing purification rasping ravages of time refinement removal resolution rubbing away sandblasting sanding scouring scrape scraping scratch scratching scrub scrubbing scuff shining shrinkage smoothing spending squandering subduction sublation subtraction taking away use using using up wastage waste wastefulness wasting away wear wear and tear wearing wearing away wearing down weathering