# AUX

/ˈoʊ/ (US)

Source: https://englishreference.com/word/aux
Updated: 2026-08-08

## Senses

### 1. audio connector

noun · CEFR B2 · Slang · Informal

the cable or port you use to connect your phone to a car or speaker to play music.

For teachers: the auxiliary audio input or cable, typically a 3.5mm jack, used to interface a portable device with a larger sound system.

- Pass me the aux so I can play my new playlist for the drive.
- The driver handed over the aux cable, allowing the passenger to take control of the audio for the remainder of the journey.

Usage: Often used with the definite article as 'the aux' or in the phrase 'pass the aux'.

Teaching tip: While technically an abbreviation, in modern youth culture 'the aux' specifically implies the power to choose the music being played.

### 2. auxiliary

adjective · CEFR C1 · Technical

a short way to write 'auxiliary', meaning extra or helping.

For teachers: Abbreviation for auxiliary. Used to describe equipment, people, or systems providing additional support.

- Check the aux input on the back of the television.
- The technician noted that the aux power supply was functioning within normal parameters during the stress test.

Usage: Commonly found in technical manuals and on hardware labels.

## Examples

- She acts as an aux for the lead singer.
- The project manager hired an aux to handle the daily emails.
- In the band's dynamic, the aux provides the steady rhythm that allows the lead vocalist to experiment with complex melodies.

---

From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.