Etymology
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impressionist (adj., n.)

in reference to a style of painting aiming to represent overall impressions as they first strike the eye rather than exact details, 1876 (adjective and noun), from French, coined 1874 by French critic Louis Leroy ("école impressionniste") in a disparaging reference to Monet's sunset painting "Impression, Soleil Levant." Later extended to other arts.

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impressionistic (adj.)
"of or pertaining to impressionists or their work," 1883; see impressionist + -ic.
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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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post-impressionism (n.)

style of painting favored in the early 20c., emphasizing structural form of the subject over natural appearance, 1910, from post- + impressionism. Related: Post-impressionist.

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