What does ambrasion mean?

"Ambrasion" is not a recognized word in the English language. It's likely a misspelling of abrasion, which means:

* The process of scraping or wearing away a surface by friction. This can happen to skin, rocks, or any other material.

For example:

* "The hiker suffered an abrasion on his knee from falling on the rocky trail."

* "The constant movement of water caused abrasion on the riverbank."

If you were thinking of a different word, please provide more context or information so I can assist you better.