That definition will tell WHAT a scratch is. Then we add "modifiers" to pin it down such as "die' scratch. Or we assign a different word such as "hairline." to name specific kinds of scratches. We can even describe its specific location once we define what a scratch is. Our definition CANNOT BE LONG, SUBJECTIVE, OR COMPLICATED. For example: There is no need to consider the length of the scratch once we add something like "of a certain length" to our definition so that a prick into the surface at one spot is eliminated. These are things that the author of that poor definition I cited above failed to do. I hope additional members will think about this question and take the time to post their thoughts. PS I don't have the answer yet in my mind (that's why my question) but I will continue to comment.