Etymology
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art nouveau

1900, from French l'art nouveau (by 1895), literally "new art" (see novel (adj.)). Called in German Jugendstil.

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Definitions of art nouveau

art nouveau (n.)
a French school of art and architecture popular in the 1890s; characterized by stylized natural forms and sinuous outlines of such objects as leaves and vines and flowers;
From wordnet.princeton.edu