AU 

AU simply means alternate universe in fan fiction forums. You take a famous person and make them unfamous, make them "normal."

In this story, Elvis never sang and he became a chef.

AU by Rayenna September 25, 2003

AU 

1. A short used for "Alternate Universe" in fan fictions.

2. The measurement of distance between the earth and the sun, usually used in measurements, an abbreviation for "Astronomical Unit".

3. The abbreviation for the element "Gold" on the periodic table.

4. An short way to say "Australia"

1) In this Undertale AU, sans and papyrus swap places.

2) The distance between the earth and pluto is approximately 34 AU.

3) AU is very expensive and rare, a very weak but corrosion resistant element.

4) For my last vacation, I went to AU.

AU by just a random online classer April 5, 2021

AU 

A fanfiction term meaning Alternate Universe.

An AU fic is a fanfic which includes elements of a book which are completely unfeasible.

That Harry Potter fic where his parents were still alive was totally an AU.

AU by Lexy C. December 9, 2007

AU 

A alternate universe, based off the game, but basically changed in some way.

Do you know what a AU is? A alternate universe, based off the game, but basically changed in some way.

AU by TeamPaydayTypicalColors2 January 11, 2017

AU 

a Chinese internet fans group of the vitual youtuber group A-SOUL. AU is a homophone same to "A友", meaning literally "the friend who is an A-SOUL fan". Unlike the insulting name "A/" meaning literally "the stack who watches A-SOUL", it is a more friendly name to call them.

"Why does AU appear in this place?"

AU by JIAXINTANG[Infwww] July 5, 2022

AU 

The astronomical unit (AU or au or a.u. or rarely ua) is a unit of distance, approximately equal to the mean distance between Earth and Sun. The currently accepted value of the AU is 149,597,870,691 ± 30 metres (about 150 million kilometres or 93 million miles).

That star is x AU's away from Earth.

AU by Maverician March 24, 2005

AU 

"AU" - the symbol for gold on the Periodical Table of Elements

A valuable metal with a yellowish color

AU by Thou-Who-Shall-Not-Be-Named August 25, 2005