parallel universe

[ par-uh-lel yoo-nuh-vurs ]

noun

1. Physics. any of a hypothetical collection of undetectable universes that are like our known universe but have branched off from our universe due to a quantum-level event. multiverse 1.
2. (in cosmology) a hypothetical universe that coexists with our known universe but may operate under fundamentally different laws of physics. multiverse 1.
3. Also called alternate universe,. (in science fiction, fantasy, etc.) a separate universe or world that coexists with our known universe but is very different from it. Compare dimension ( def 8 ).
4. a realm of existence and experience that is fundamentally different from the one that most humans share; a separate reality:

   I don’t understand him—I think he lives in a parallel universe.

Word History and Origins

Origin of parallel universe¹

First recorded in 1920–25

Example Sentences

He eventually found empathy for Chris by bringing himself into the story, imagining the events of the film were happening to him in a parallel universe.

From Los Angeles Times

But another questioned whether they were living in a "weird parallel universe", adding: "Is this a really early April Fool?"

From BBC

The singles in “Love Is Blind” seem to exist in a parallel universe, curiously devoid of the intense polarization that consumes the rest of the country and compels many Americans to size up their neighbors, prospective romantic partners, athletes and favorite pop stars based on how they vote.

From Los Angeles Times

A government insider suggests without the UK, US and Western allies urging restraint on a daily basis, there is a parallel universe where the conflicts might already have boiled over into a war far worse than anything we have seen so far.

From BBC

On paper, it was the quintessential family activity, melding fun with familiarity — an updated version of Mom and Dad’s old haunt, surrounded by my best friends, while throwing our heads around to “Can’t Stop” and “Parallel Universe.”

From Salon