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  

abbreviation

1. Australia

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Au ² British  

symbol

1. gold

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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

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

External link The company is also central to what is au courant: the credit cycle and the AI boom, and also as an investment opportunity itself—or not.

From Barron's • Oct. 24, 2025

“And make the coffee very strong and hot and fill the cups with half coffee and half hot milk and we’ll toast 1918 in café au lait.”

From "A Tree Grows in Brooklyn" by Betty Smith