1. ATion> K&R. 2. ATion, file formAT> The fourth book in Adobe Systems, Inc.' s PostScript series, describing the previously-secret formAT of Type 1fonts. The other three official guides are known as the Blue Book, the {Green Book}, and the {Red Book}. ["Adobe Type 1 Font FormAT, version 1.1", Addison-Wesley, 1990 (ISBN 0-201-57044-0)]. 3. White book CD-ROM. [Jargon File] (1996-12-03)