historicismPronunciation: /hɪˈstɒrɪsɪz(ə)m/Definition of historicism noun [mass noun] 1the theory that social and cultural phenomena are determined by history. the belief that historical events are governed by natural laws. 2the tendency to regard historical development as the most basic aspect of human existence. 3(in artistic and architectural contexts) excessive regard for past styles. Derivatives historicist noun Origin: late 19th century: from historic, translating German Historismushistoricism in other Oxford dictionaries Definition of historicism in the US English dictionary