au definition

  • noun:
    • a typical English digraph representing generally the sound of “broad a” (â), but frequently also ä.
    • To the; within; utilizing the: the dative regarding the French definite article, occurring in certain expressions frequently used in English, as au fait, au fond, au revoir, etc.
    • The chemical sign of gold (L., aurum).
    • a soft yellowish malleable ductile (trivalent and univalent) metallic element; happens mainly as nuggets in rocks and alluvial deposits; does not respond with most chemical substances but is attacked by chlorine and aqua regia
    • a unit of size utilized for distances in the solar power system; corresponding to the mean distance between the world and sunlight (about 93 million miles or 150 million kilometers)

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