# AU

> English word · Noun · frequency rank #6,867

## Definitions
1. Initialism of alopecia universalis.
2. Initialism of astronomical unit.
3. Initialism of angstrom unit.
4. Initialism of alternate universe /alternative universe.
5. Initialism of arbitrary unit.
6. Initialism of animal unit.

## Easily confused with
- **aw** (https://plainspell.com/en/vs/au-vs-aw)
- **AZ** (https://plainspell.com/en/vs/au-vs-az)
- **av** (https://plainspell.com/en/vs/au-vs-av)
- **ay** (https://plainspell.com/en/vs/au-vs-ay)
- **ax** (https://plainspell.com/en/vs/au-vs-ax)
- **ave** (https://plainspell.com/en/vs/au-vs-ave)
- **aye** (https://plainspell.com/en/vs/au-vs-aye)
- **awe** (https://plainspell.com/en/vs/au-vs-awe)
- **axe** (https://plainspell.com/en/vs/au-vs-axe)
- **aww** (https://plainspell.com/en/vs/au-vs-aww)
- **Ava** (https://plainspell.com/en/vs/au-vs-ava)
- **aux** (https://plainspell.com/en/vs/au-vs-aux)
- **Avi** (https://plainspell.com/en/vs/au-vs-avi)
- **AWS** (https://plainspell.com/en/vs/au-vs-aws)
- **aud** (https://plainspell.com/en/vs/au-vs-aud)
- **ayr** (https://plainspell.com/en/vs/au-vs-ayr)
- **Ayn** (https://plainspell.com/en/vs/au-vs-ayn)
- **aya** (https://plainspell.com/en/vs/au-vs-aya)
- **awa** (https://plainspell.com/en/vs/au-vs-awa)
- **Avs** (https://plainspell.com/en/vs/au-vs-avs)

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