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

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

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