Across, crossing, or extending across a galaxy. Compare galaxy-wide, pangalactic.
- 1930 W.O. Stapledon Last & First Men (1931) № 365: Only within the last few years have we succeeded in designing an artificial human dust capable of being carried forward on the sun's radiation, hardy enough to endure the conditions of a trans[-]galactic voyage of many millions of years.
- 1953 T. Sturgeon World Well Lost Saucer of Loneliness (2000) № 63: Of these hindrances, all could be understood but one, and that one was Dirbanu, a transgalactic planet which shrouded itself in impenetrable fields of force whenever an Earth ship approached.
- 1957 H. Ellison Deeper than Darkness Infinity SF (Apr.) № 7/2: While the inverspace ships plied between worlds, while Earth fought its trans[-]galactic wars, in a rural section of the American continents, a strange thing was happening.
- 1970 R. Silverberg Tower of Glass (2000) № 104: They couldn't have reached a technological level that would allow them to send transgalactic messages at all unless they were able to retain the achievements of earlier generations.
- 1981 W. Gibson Hinterlands Burning Chrome (2003) № 65: A constant stream of raw data goes pulsing home to Earth, a flood of rumors, whispers, hints of transgalactic traffic.
- 2002 I. Csicsery-Ronay, Jr. Dis-Imagined Communities V. Hollinger & J. Gordon Edging into Future № 224: Simmons consciously models his transgalactic polity as a dispersed replay of earthly human history. The galaxy is replete with colonies and protectorates linked by several kinds of matter-transmission technology.
