What does universe mean?
The universe is the totality of everything that exists: space, time, matter, and energy, together with the relationships among them. In astronomy and cosmology, the word refers to the physical cosmos as a whole, and expressions such as “the observable universe” distinguish the portion that can presently be examined from the universe in principle. In literature, philosophy, and popular culture, “universe” can also mean a complete fictional world, a realm of possibilities, or an organized system of ideas. The word carries a sense of vastness and completeness, often suggesting that the subject being discussed is greater than any individual perspective. It is useful in both literal and metaphorical contexts, expressing the boundaries of reality or the scope of an entire field. Its Latin roots emphasize the idea of a unified whole, a meaning that remains central to its modern uses.
nounThe totality of all existing space, time, matter, and energy. By extension, it can mean a complete world, realm, or system of possibilities, especially in literary, philosophical, and scientific contexts.
- The totality of all existing space, time, matter, and energy, especially as considered in astronomy or cosmology.
- A complete world, realm, or domain, whether actual, fictional, hypothetical, or conceptual.
- An indefinitely large collection of things that can be viewed as forming a unified whole.
"Astronomers use powerful instruments to study the oldest light reaching us from across the universe."
"The universe is expanding, although the rate of expansion remains an important subject of research."
"The novel invites readers to imagine a universe in which memory can be traded and exchanged."
Usually singular for the cosmos as a whole; the plural is used when referring to separate possible realities, fictional worlds, or conceptual systems.
"The science-fiction series explores several parallel universes."
The word universe comes from Latin for “the whole,” so it has always carried the idea of everything belonging to one vast totality.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does universe come from?
The word entered English through Old French from Latin, where universum meant “the whole” and was the neuter form of the adjective universalis, “universal” or “whole.” Its development preserved the central sense of a complete totality, while later usage expanded the word to refer to the cosmos and to imagined or conceptual worlds. English cognates including universal, universality, universalism, and university reflect the same Latin foundation associated with unus, “one.”
How universe is actually used
In scientific contexts, the term is usually precise and formal. In literary or philosophical contexts, it can be metaphorical, referring to a complete reality, a world, or the full scope of a subject. “The universe” is normally singular; “universes” is used for distinct possible realities or conceptual systems.
Easily confused with universe
A universe is a complete reality or world, whereas a university is an institution of higher education.