(science fiction) A compendium of all knowledge, or most of the important knowledge, an encyclopedia for a galaxy-spanning civilization. A science-fictional analogue of the Encyclopedia Britannica. This term is used in many works by many authors, and prominently found in Douglas Adams' Hitch Hiker's Guide to the Galaxy series and Isaac Asimov's Foundation series.

With regard to galaxies, or in a galactic context. / To a huge degree; immensely.

galactic; relating to a galaxy