(uncountable) The universe is the whole space we live in and everything it contains: our Milky Way and billions of other galaxies that are not all known are part of our universe.
According to recent theories, our universe would be bent on itself, being finite but having no frontiers.
(countable) A universe can also stand for a world or an area, fictional or not, considered in itself.
Musical universes are so varied that we cannot know them all.
(countable) A universe is also an imaginary set of worlds invented by someone.
