Existing or happening between different galaxies in space, especially in science fiction.
From 'inter-' meaning 'between' plus 'galactic' (relating to galaxies). This is a modern term that became popular with 20th-century science fiction.
If you could somehow travel between galaxies at light speed, it would take 2.5 million years just to reach Andromeda—so 'intergalactic' isn't just about distance, it's about timescales that make human civilization look like a blink!
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