'Impressionism' definitions:

Definition of 'Impressionism'

From: WordNet
noun
A school of late 19th century French painters who pictured appearances by strokes of unmixed colors to give the impression of reflected light

Definition of 'Impressionism'

From: GCIDE
  • Impressionism \Im*pres"sion*ism\, n. [F. impressionnisme.] (Fine Arts) The theory or method of suggesting an effect or impression without elaboration of the details; -- a disignation of a recent fashion in painting and etching. [1913 Webster]