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Definitions of Parallel universe on the Web:

An alternative reality similar to this one in which a person makes different critical choices, and goes in different directions as a result.
www.summerjoy.com/Glossary.html

A timestream which resembles the base timestream and where similar events occur for wildly different reasons. The so-called Mirror Universe in 2266 was a Parallel Universe, but because of a change made by James T. …
www.coldnorth.com/owen/game/startrek/universe/source/temporal.htm

Parallel Universe produced the film documentaries info wars and The War on Drugs. Parallel Universe is based in Europe and was founded in 2004.
en.wikipedia.org/wiki/Parallel Universe (film)

“Parallel Universe” is a song by the Red Hot Chili Peppers from their 1999 album, Californication. It was released as a single in the USA and Canada although a video was never made for the song.
en.wikipedia.org/wiki/Parallel Universe (song)

Parallel Universe is the first album by the drum and bass group 4 Hero.
en.wikipedia.org/wiki/Parallel Universe (album)

Parallel universe or alternate reality in science fiction and fantasy is a self-contained separate reality coexisting with our own. …
en.wikipedia.org/wiki/Parallel universe (fiction)

Parallel Universe was the twelfth Red Dwarf episode to air, the sixth of the second series.
en.wikipedia.org/wiki/Parallel Universe (Red Dwarf episode)