Full record for intergalactic adj.

Definition	Situated between the galaxies; of, pertaining to, or occupying the regions between galaxies.
OED requirements	antedating 1920
Earliest cite	Fort Worth Star-Telegram, May 2 1920
Comment	Bill Mullins submitted a cite for "inter-galactic" from a 1920 newspaper. Earliest cite in the OED: 1928
Last modified	14 January, 2009

Citations for intergalactic adj.

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1968 S. E. Whitfield in S. E. Whitfield & G. Roddenberry Making of ‘Star Trek’ iv. vi. 356	Bill can work only with materials available here on Earth. (Until the next intergalactic trading ship drops anchor on this planet, anyway.)
1970 G. Dickson Hour of Horde iii. 36	The figures of the two men disappeared and were replaced by what looked like a glowing spiral of dust floating against a black background—‘will shortly be facing attack by a roving intergalactic race which periodically preys upon those island universes like our galaxy which dot that intergalactic space’.
1988 S. McCrumb Bimbos of Death Sun i. 7	Perhaps ‘G’ stood for Ganymede, or some other intergalactic place.
1992 M. Okrand Klingon Dictionary 10	For intra-and intergalactic communication, the Klingon government, along with most other governments, has accepted English as the lingua franca.
2005 I. M. Banks Algebraist iii. 166	The outward journey allegedly took almost no time, because it was conducted through an intergalactic wormhole, the portal location of which is amongst those included in the Dweller List.