“By them time he and Jack returned to New York in October of 1958, Random House had published Breakfast at Tiffany’s, and Esquire, in its November issue, had serialized the novel in full.”
Fifth Avenue, 5 A.M. by Sam Wasson
Taken from Wikipedia: “In literature, a serial is a publishing format by which a single large work, most often a work of narrative fiction, is presented in contiguous (typically chronological) installments—also known as numbers, parts, or fascicles—either issued as separate publications or appearing in sequential issues of a single periodical publication. More generally, serial is applied in library and information science to materials “in any medium issued under the same title in a succession of discrete parts, usually numbered (or dated) and appearing at regular or irregular intervals with no predetermined conclusion.”
More on the serialization of literature here.