What is Lookup Lookup is an integrated search interface with electronic dictionaries for the Emacs text editor. You can use various kinds of dictionaries, such as CD-ROM books and online dictionaries, in an efficient and effective manner. Latest Release Stable version: Lookup 1.3, eblook-1.3 Lookup 2.0 Release Lookup 2.0 is under the development. Beta quality version: Lookup 1.99.95 (for Emacs 23.