Special Collection: First edition books. Examples:

In publishing terms, a first edition book is all copies that were printed from the same setting of type as when first published. The book is only described as a second edition if significant changes are made to the copy. In collecting terms, a general definition of 1st edition book would be a work's first commercially available appearance in book form, printed with the original setting of type. The first time a publisher releases a new book, all copies of that book printed without major changes can be considered a first edition book.[3]

[3] Identifying and collecting first editions. AbeBooks