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

Two men and two women, whose identities have not been released, died while trying to board a water taxi off the coast of Saint Etienne au Mont, near Calais.

From BBC • Apr. 10, 2026

Writing in a local cafe is not only cheaper—the price of a café au lait—but also offers the illusion of companionship without any of its intrusions.

From The Wall Street Journal • Mar. 27, 2026

Coquilles Saint-Jacques is essentially a frou-frou description for scallops au gratin, more often prepared as a casserole than in those magical shells which are harder to find these days.

From Salon • Nov. 1, 2025

Towers of onion rings stacked high, bone-in rib-eyes, bubbling pots of lobster mac and cheese, fries and meats drowning in au poivre.

From Los Angeles Times • Oct. 31, 2025

Quant au courage moral, il avait trouvé fort rare, disait-il, celui de deux heures après minuit; c’est-à-dire le courage de l’improviste.

From "Watership Down: A Novel" by Richard Adams