1. the act or process of erasing or scraping away; removal by rubbing or scratching
Usage: formal or technical; less common than 'erasure'
2. a mark or area where something has been erased or scraped off
Usage: archaic or rare

Examples

• The erasion of the pencil marks left a faint smudge on the paper.
• The document showed signs of erasion where the original text had been removed.
• Careful erasion of the surface was required to prepare it for painting.
• The historian examined the erasion on the old manuscript to understand its provenance.