Added 10 October 2026 aux /ˈɔks/ symbol Categories: Uncommon Words symbol ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about aux at Wordnik → Where our words come from → ISO 639-3 language code for Aurá. adjective Clipping of auxiliary. noun The auxiliary audio connector of a sound system. Hey, pass the aux. I'll play some music from my phone. Related Words: subsidiaryancillarywithauxiliaryassistantquanttheforsubboisassistantsauxiliaries Back to today's word