Phrase guide

mirror universe

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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1

noun

Meaning 1

An alternative universe within a fictional work, separate from the universe normally depicted, where familiar characters and settings are present but in a systematically "reversed" manner, often by being evil or otherwise hostile.

Definition source: English Wiktionary via Wiktextract

Topics: literature, media, publishing, science-fiction

Examples

  • Star Trek: The Original Series introduced a mirror universe in which humans had aggressively conquered parts of the galaxy rather than forming the peaceful Federation, and the setting was revisited in several of the franchise's spinoff shows.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A hypothetical universe, a counterpart to this universe but with certain elementary particles reversed in a specific way.

Definition source: English Wiktionary via Wiktextract

Usage: rare

Topics: astronomy, cosmology, natural-sciences, physical-sciences, physics

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

No etymology was provided for this word.