impressionism (n.)

1839 as a term in philosophy, from impression + -ism. With reference to the French art movement, 1879, from impressionist. Extended 1880s to music (Debussy), literature, etc.

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Definitions of impressionism from WordNet

Impressionism (n.)
a school of late 19th century French painters who pictured appearances by strokes of unmixed colors to give the impression of reflected light;