outside the Milky Way system.

1850–55; extra- + galactic

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World English Dictionary
extragalactic (ˌɛkstrəɡəˈlæktɪk)
occurring or existing beyond the Galaxy

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
What they've seen is that higher-energy gamma rays from an extragalactic flare arrive later than lower-energy ones.
The nail in the coffin were number counts, showing evolution of extragalactic sources.
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