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

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

However, Nelson is less au fait with Asian finance and politics than his predecessor, Mark Tucker, a veteran of Hong Kong’s insurance industry.

From The Wall Street Journal • Dec. 4, 2025

I understand that in many American homes, this is called 'the mother-in-law suite,’ and that is where an au pair would normally sleep.

From "Silent To The Bone" by E.L. Konigsburg