illusionism Syllabification: (il·lu·sion·ism)Pronunciation: /iˈlo͞oZHəˌnizəm/Definition of illusionism noun the principle or technique by which artistic representations are made to resemble real objects or to give an appearance of space by the use of perspective. Derivatives illusionisticPronunciation: /iˌlo͞oZHəˈnistik/ adjective illusionism in other Oxford dictionaries Definition of illusionism in the British & World English dictionary