Minor changes made to a portion of the edition during the manufacturing stage and before all of the books were complete and released.
The changes can be intentional. For example, a different state may be caused by a correction in the text or illustrations, an insertion of cancels or advertisements, or a different paper used without the intention of creating a separate issue.
The changes can also be accidental; for example, a variation in the text or illustrations might occur during the printing.
The term does not refer to condition.