au

Reading level: hard

Estimated CEFR level: C1 — Advanced

Estimated from word frequency; not an official CEFR classification.

Definition

noun a soft yellow malleable ductile (trivalent and univalent) metallic element; occurs mainly as nuggets in rocks and alluvial deposits; does not react with most chemicals but is attacked by chlorine and aqua regia
noun a unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles or 150 million kilometers)

Au secours!” No voice responded. — The Awakening, and Selected Short Stories, Kate Chopin
Au revoir, all of you. — The Yellow Crayon, E. Phillips (Edward Phillips) Oppenheim
Oh!” “Well, au revoir, Bolkónski! — War and Peace, Leo, graf Tolstoy

gold, atomic number 79

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