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. African Union

2. Also: a.u..  angstrom unit

3. Also: a.u..  astronomical unit

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au ³ British  

abbreviation

1. Australia

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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

But with some notable exceptions—Henri-Georges Clouzot’s “Diabolique,” Julien Duvivier’s “Panique” and Jacques Becker’s “Touchez pas au Grisbi” among them—much of this tradition remains unknown to American viewers.

From The Wall Street Journal • Jan. 21, 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

Maman Thibaut has been dosing Amélie with café au lait at the big kitchen table.

From "Code Name Verity" by Elizabeth Wein