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  1. Oxford American Dictionary

    closed universe

    • IPA[klōzd ˈyo͞onəvərs]
    • n.
      the condition in which there is sufficient matter in the universe to halt the expansion driven by the Big Bang and cause eventual recollapse. The amount of visible matter is only a tenth of the total required for closure, but there may be large quantities of dark matter.

    • noun: closed universe