'Machine cleaned': The disc has been polished in a professional refurbishing machine. This reduces scratches & scuffs, and cleans fingerprints & dirt from the playing surface of the disc, reducing the chance of errors and often making the disc appear almost as good as new. Some residue from the compound used in the cleaning machine can sometimes be visible. This will not affect the operation of the disc.
'Complete': Used in the title, meaning that the game disc, instruction manual and cover are present. It does not imply that any other item is included.
'Almost as new': If I have used this term, the item is probably as good as new. I add the word 'almost' just in case there is a tiny imperfection that I haven't noticed!
'Handling marks': Usually used to describe finger marks. The disc will be free of scratches, but may have light fingerprints, or minor scuffs.
'Usage marks': The disc may have light surface marks in addition to finger marks, but nothing 'feelable' that will affect its operation.
'Cleaning marks': The disc has been cleaned to remove significant marks, either by myself, or a previous owner. Signs of this cleaning, such as light smears, etc., may be evident on the surface.
'Light surface marks': The disc has minor scratches. A disc that is described as lightly surface marked will have visible scratches on the surface, but nothing deep enough to feel with a fingernail. Fully working.
'Surface marks': Used to describe more significant scratches. A disc that is described as surface marked will have obvious scratches, but will have been tested, and found to be working on my console, despite the marks.
'Sticker removal residue': Glue or remnants of paper left on items after the removal of stubborn stickers.
'Age related marks': The light scratches, stains or indentations sometimes evident on items.