1.
a. : the copies of a literary work first printed from the same type and issued at the same time
b. : the first pressrun of a newspaper for a given date
2. : a single copy from a first edition
* * *
noun, pl ⋯ -tions
[singular] : the first set of printed copies of a book
There were many errors in the book's first edition.
also [count] : a single copy from such a set
She owns a valuable first edition of Huckleberry Finn.
* * *
one of the copies of a book that was produced the first time the book was printed
Useful english dictionary. 2012.