au

¹ American  

[oh] / oʊ /

French.

plural

aux

1. to the; at the; with the.

---

Au ² American  

abbreviation

1. author. Also au

---

Au ³ American  

Symbol, Chemistry.

1. gold.

---

AU ⁴ American  

abbreviation

1. astronomical unit.

---

A.U. ⁵ American  

Or a.u.

abbreviation

1. angstrom unit.

---

Au ¹ British  

symbol

1. gold

---

AU ² British  

abbreviation

1. African Union

2. Also: a.u..  angstrom unit

3. Also: a.u..  astronomical unit

---

au ³ British  

abbreviation

1. Australia

---

AU Scientific  

1. Abbreviation of astronomical unit

---

Etymology

Origin of Au

From the Latin word aurum

Example Sentences

Variety described it as "dutiful fan service, sure to satisfy legions of cultists cosplaying in tweed, but not unapproachable to viewers who aren't entirely au fait with the show".

From BBC • Mar. 5, 2026

It’s exactly what it sounds like: toasted French or Italian bread soaked in the rich, savory au jus of an Italian beef sandwich.

From Salon • Dec. 7, 2025

However, Nelson is less au fait with Asian finance and politics than his predecessor, Mark Tucker, a veteran of Hong Kong’s insurance industry.

From The Wall Street Journal • Dec. 4, 2025

Here he is the 1919 go-between for Esther Nacht, a 14-year-old Jewish refugee whom he places with the Winslow family as an au pair.

From Los Angeles Times • Nov. 1, 2025

When I tried to look it up, I couldn’t because awe is in the dictionary and so is pear, but awe pear is not au pair.

From "Silent To The Bone" by E.L. Konigsburg