Yes, the word "universe" does indeed have a plural form: "universes". In the grand scheme of grammar, the term "universe", like most nouns, can find itself expanded to discuss multiples. For instance, when we start marveling at the mysteries beyond our own cosmic neighborhood and entertaining theories of multiple realities, we slip into the realm of "universes". This lends itself nicely to the science fiction genre, too, where alternative "universes" often play a pivotal role. But remember, in basic conversation and writing, we typically use the singular form "universe" because we live in just one universe!
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