The Collaborative International Dictionary of English v.0.48:

Classicism \Clas"si*cism\, n.
   A classic idiom or expression; a classicalism. --C. Kingsley.
   [1913 Webster]

WordNet (r) 3.0 (2006):

classicism
    n 1: a movement in literature and art during the 17th and 18th
         centuries in Europe that favored rationality and restraint
         and strict forms; "classicism often derived its models from
         the ancient Greeks and Romans" [syn: classicism,
         classicalism] [ant: Romantic Movement, Romanticism]