au

¹ American  

[oh] / oʊ /

French.

plural

aux

1. to the; at the; with the.

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Au ² American  

abbreviation

1. author. Also au

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Au ³ American  

Symbol, Chemistry.

1. gold.

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AU ⁴ American  

abbreviation

1. astronomical unit.

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A.U. ⁵ American  

Or a.u.

abbreviation

1. angstrom unit.

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Au ¹ British  

symbol

1. gold

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au ² British  

abbreviation

1. Australia

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AU ³ British  

abbreviation

1. African Union

2. Also: a.u..  angstrom unit

3. Also: a.u..  astronomical unit

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AU Scientific  

1. Abbreviation of astronomical unit

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Etymology

Origin of Au

From the Latin word aurum

Example Sentences

On the menu is uni pasta, hanger steak au poivre and a dry-aged burger with fries, which restaurant critic Bill Addison says doesn’t require any twists because “it’s simply a fantastic burger.”

From Los Angeles Times • Mar. 9, 2026

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

One of the few au courant innovations on “What’s in the Box?” involves surveillance: As one couple answers questions, the camera eavesdrops on the conversations among their competition, which can range from catty to worse.

From The Wall Street Journal • Dec. 16, 2025

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

We had hardly seen each other over the summer, and the first words out of his mouth were, “Our au pair has arrived from England.”

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