A world is simply one physical being in the span of something much larger, much greater. If you travel outside of your own planet, there are several more like it, in separate galaxies and sectors.
All of these planets, all of these galaxies, exist within a Universe, or a dimension, if that's a more appropriate word. The dimension contains these worlds, but there are more than one of those, as well. There could be an infinite number of dimensions we don't know about.
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All of these planets, all of these galaxies, exist within a Universe, or a dimension, if that's a more appropriate word. The dimension contains these worlds, but there are more than one of those, as well. There could be an infinite number of dimensions we don't know about.
Oh, and they're not easy to get to.