A universe is a single dimension that contains a virtually infinite amount of space. The dimension where the planet Earth exists and shares space with other celestial bodies is a universe, and can be simply called the "Earth universe" or Earthspace. Other examples of universes include the Dark Dimension and the Astral Plane.
It should be noted that all spatially-infinite dimensions are technically speaking an alternate/parallel universe to a given Earthspace. However, the term of "alternate universe" and "parallel universe" are reserved to the infinite variants of any given universe with an Earth that also possess an Earth. Because of this, the term "universe" itself is often used interchangeably with reality, a reality being a collection of dimensions that includes an Earthspace.
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