pleinairism en · NOUN
Etymology
From en plein air + -ism.
Meanings
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(uncountable) The practice of painting outdoors, in the open.
Some Americans may have concluded that such passionate pleinairism was unsustainable; it may have seemed too chaotic, insubstantial, repetitious, or ugly.
2017, Kathleen A. Foster, American Watercolor in the Age of Homer and Sargent, page 214: