Real Dictionary

classicism
uncountable noun: Classicism is a style of art practised especially in the 18th century in Europe. It has simple regular forms and the artist does not attempt to express strong emotions.

classicism in American English
the aesthetic principles or qualities regarded as characteristic of ancient Greece and Rome; objectivity, formality, balance, simplicity, restraint, etc.
noun: the principles or styles characteristic of the literature and art of ancient Greece and Rome

classicism in British English
noun: a style based on the study of Greek and Roman models, characterized by emotional restraint and regularity of form, associated esp with the 18th century in Europe; the antithesis of romanticism