# mirror universe

> English word · Noun

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

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/mirror-universe