We found one dictionary that defines the word observable universes:

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1. observable universes: Wiktionary

▸ Words similar to observable universes ▸ Usage examples for observable universes ▸ Idioms related to observable universes ▸ Wikipedia articles (New!) ▸ Words that often appear near observable universes ▸ Rhymes of observable universes ▸ Invented words related to observable universes