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

Alnour Mohamed Ali, a Sudanese national, was charged with endangering life after the four people died while trying to board a water taxi off the coast of Saint Etienne au Mont, near Calais.

From BBC • Apr. 11, 2026

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

Anna, who arrived in Germany as an au pair from Ukraine 15 years ago, now works in human resources at the joint venture.

From The Wall Street Journal • Mar. 2, 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

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

From "Code Name Verity" by Elizabeth Wein