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

I snagged a pain au chocolat for the flight.

From The Wall Street Journal • Mar. 18, 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

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

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

It loved Camilla, and followed her everywhere: Henry quoted long passages about Emma Bovary and her greyhound: “Sa pensée, sans but d’abord, vagabondait au hasard, comme sa levrette, qui faisait des cercles dans la campagne....”

From "The Secret History" by Donna Tartt