The universe is a big word — in fact, it includes all matter and all of space.

We can't see or know much about the outer limits of the universe, but we know that it has them, and the idea of matter contained within boundaries gives us other meanings for the word. You might refer to a "universe of ideas," or when conducting a scientific study, create "a universe of data." Universe can also mean a defined set of something — the five blocks between the playground and home can be the whole universe for a small child.

Definitions of universe

n everything that exists anywhere

“they study the evolution of the universe
cosmos, creation, existence, macrocosm, world
closed universe
(cosmology) a universe that is spatially closed and in which there is sufficient matter to halt the expansion that began with the big bang; the visible matter is only 10 percent of the matter required for closure but there may be large amounts of dark matter
natural order
the physical universe considered as an orderly system subject to natural (not human or supernatural) laws
the natural physical world including plants and animals and landscapes etc.
Type of:
natural object
an object occurring naturally; not made by man

n everything stated or assumed in a given discussion

universe of discourse
Type of:
cognitive content, content, mental object
the sum or range of what has been perceived, discovered, or learned

n (statistics) the entire aggregation of items from which samples can be drawn

a population that is part of a larger population
Type of:
accumulation, aggregation, assemblage, collection
several things grouped together or considered as a whole