suffix, counter
Suffix or counter used after a number to indicate the printing or edition of a publication, such as a book or newspaper. Often seen in contexts like 初刷 (first printing) or 増刷 (additional printing).
この本は初刷がすぐに売り切れた。
The first printing of this book sold out immediately.
新聞の朝刷と夕刷では内容が少し違う。
The morning edition and the evening edition of the newspaper have slightly different content.