Definition of Impressionism noun from the Oxford Advanced American Dictionary

 

Impressionism

 noun
noun
NAmE//ɪmˈprɛʃəˌnɪzəm//
 
[uncountable]
 
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a style in painting developed in France in the late 19th century that uses color to show the effects of light on things and to suggest atmosphere rather than showing exact details
Impressionist
 
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adjective [usually before noun] Impressionist landscapes
See the Oxford Advanced Learner's Dictionary entry: Impressionism