universe

IPA/ˈjuːnɪvɜːs/
KK[jˈunəvˌɚs]IPA/ˈjuːnɪvɜːrs/

universe — noun

  • universesingular
  • universesplural

1. all matter, energy, stars, planets, and galaxies that exist, considered together

1.nounA2
Definition

all matter, energy, stars, planets, and galaxies that exist, considered together as one complete system

Example

Jiwoo learned that the universe contains billions of galaxies, each with millions of stars.

the universe contains + number + of + noun

Christopher pointed his telescope towards the night sky to observe distant parts of the universe.

observe distant parts of the universe

Common collocations
  • the observable universe
  • the known universe
  • the expanding universe
  • the centre of the universe
Synonyms
  • cosmos

    more poetic or philosophical, often implies an ordered system

  • space

    broader term that can mean the empty area between objects, not a complete system

  • creation

    adds a religious perspective that a divine force brought everything into being

Grammar Patterns

the universe

the universe + verb (contains, expands, began)

the + adjective + universe (observable, known, expanding)

Usage Note

Usually used with the definite article 'the' — 'the universe.' This sense is rarely used in the plural form.

Common Mistakes

The Milky Way is the universe.
The Milky Way is a galaxy within the universe.
A galaxy is a single system of stars, while the universe contains all galaxies.

2. a separate version of reality that exists only in imagination or in theory, dist

2.nounB2
Definition

a separate version of reality that exists only in imagination or in theory, distinct from the known universe we live in

Example

Amani enjoyed science-fiction stories set in a universe where time flows backwards.

a universe where [clause]

Tariq read that some physicists believe every choice creates a new parallel universe.

every choice creates a new parallel universe

Common collocations
  • an alternate universe
  • a parallel universe
  • another universe
Synonyms

Grammar Patterns

a/an + adjective + universe

a universe where/with/in which + clause

a universe of + noun

Usage Note

Often used with modifiers such as 'alternate,' 'parallel,' 'alternative,' or 'another' to distinguish it from our own universe. Common in science fiction and theoretical physics.

3. the particular area of life, activity, or experience that a person belongs to or

3.nounB1
Definition

the particular area of life, activity, or experience that a person belongs to or is familiar with

Example

Manuela's whole universe changed when she moved from her small town to the capital city.

possessive + universe

Hoa discovered a new universe of music after joining the school orchestra.

a new universe of [domain]

Common collocations
  • her whole universe
  • the universe of fashion
  • a new universe of possibilities
Synonyms
  • world

    more common in everyday speech, less dramatic

  • sphere

    suggests a more clearly defined domain of activity

  • realm

    more formal or literary in tone

Grammar Patterns

possessive + universe

the universe of + noun (field, activity)

a new universe

Usage Note

Often used with a possessive adjective ('my universe,' 'her universe') or an of-phrase ('the universe of publishing'). Metaphorical rather than literal — do not confuse with sense 1.

Common Mistakes

The universe of this classroom is very small.' (too literal, sounds odd).
The world of this classroom is very small.
For physical scale, use 'world' or 'space'; reserve 'universe' for areas of experience or activity.

4. a complete and self-contained system of ideas, rules, or knowledge that function

4.nounC1
Definition

a complete and self-contained system of ideas, rules, or knowledge that functions independently and has its own internal logic

Example

Élise studied the mathematical universe of non-Euclidean geometry in her advanced class.

the mathematical universe of [domain]

In the universe of computer programming, each language has its own rules and conventions.

in the universe of [domain]

Common collocations
  • the universe of discourse
  • a moral universe
  • a conceptual universe
Synonyms
  • system

    more general, less grand in tone

  • domain

    focuses on scope rather than self-contained structure

Grammar Patterns

the universe of + noun (mathematics, physics, ideas)

a/the + adjective + universe (mathematical, conceptual, moral)

Usage Note

Frequently used in academic and philosophical writing. Typically followed by 'of + domain' ('the universe of physics,' 'the universe of discourse'). The emphasis is on the system being self-contained, not on physical space.

5. in logic or mathematics, the complete collection of items, possibilities, or var

5.nounC1
Definition

in logic or mathematics, the complete collection of items, possibilities, or variables that are being considered within a specific argument or problem

Example

In logic class, the professor defined the universe as all possible outcomes of the experiment.

defined the universe as [set]

When solving the equation, you must first identify the universe of numbers that are allowed.

the universe of numbers

Common collocations
  • universe of discourse
  • universe of numbers
  • universe of possible values
Synonyms

Grammar Patterns

the universe of discourse

universe of + plural noun (numbers, outcomes, elements)

define/identify + the universe

Usage Note

A technical term used mainly in logic, mathematics, and formal semantics. The phrase 'universe of discourse' is the most common expression in logic. In set theory, it is often called the 'universal set.'

6. in statistics and research, the complete group of people, objects, or data that

6.nounB2
Definition

in statistics and research, the complete group of people, objects, or data that you want to study, from which a smaller sample is taken

Example

The research universe consisted of all registered voters in the country over the age of 18.

universe consisted of [set]

Lakshmi defined her study universe as every patient treated at the hospital last year.

defined [possessive] study universe as

Common collocations
  • study universe
  • target universe
  • survey universe
  • universe of patients
Synonyms
  • population

    more common in modern statistical writing

  • sampling frame

    more specific — the actual list from which the sample is drawn

Antonyms
  • sample

    the subset taken from the universe

Grammar Patterns

study universe

universe of + plural noun/group (voters, patients, shoppers)

the + adjective + universe (entire, target, survey)

Usage Note

In modern statistics, 'population' is more common than 'universe,' though the two terms are interchangeable in this sense. 'Universe' is frequently used in survey methodology and market research.

Word family

Synonym discussion

Sense: noun/1

While universe refers to the entire system of all matter, energy, and space as a whole, cosmos is a more poetic or philosophical term that often implies an orderly, harmonious system. Space is much broader — it can mean the empty area between objects or simply physical extent, but it does not carry the sense of a complete, structured system. Galaxy is far narrower, referring to a single large collection of stars such as the Milky Way, of which there are billions within the universe. Creation overlaps with universe but adds a religious or spiritual perspective, implying that a divine force brought everything into being. For everyday use, universe is neutral and scientific; cosmos sounds elevated or literary; space works for informal references to the sky and stars. For example, 'The Hubble telescope explores the universe' sounds scientific, while 'The Hubble telescope explores space' is more general.

cosmos ↗space ↗galaxy ↗creation ↗

Common collocations

Adverbs

Phrases

  • the universe of + domain (the universe of music, the universe of mathematics)

Prepositions

  • in the universe
  • across the universe
  • throughout the universe
  • of the universe

Etymology

LatinFrenchEnglish

Universe comes from the Latin word 'universum,' a combination of 'uni-' (one) and 'versum' (turned, from 'vertere' meaning to turn). The original idea was 'everything turned into one' — a single, unified whole that contains all existing things. Latin 'universum' passed into Old French as 'univers' before entering English around the 14th century.