Source : Webster's Revised Unabridged Dictionary (1913)

Neoimpressionism \Ne`o*im*pres"sion*ism\, n. (Painting)
   A theory or practice which is a further development, on more
   rigorously scientific lines, of the theory and practice of
   Impressionism, originated by George Seurat (1859-91), and
   carried on by Paul Signac (1863- -) and others. Its method is
   marked by the laying of pure primary colors in minute dots
   upon a white ground, any given line being produced by a
   variation in the proportionate quantity of the primary colors
   employed. This method is also known as {Pointillism}
   (stippling).

Source : WordNet®

pointillism
     n : a school of painters who used a technique of painting with
         tiny dots of pure colors that would blend in the viewer's
         eye; developed by Georges Seurat and his followers late
         in 19th century France