phenomenalism Syllabification: (phe·nom·e·nal·ism)Pronunciation: /fəˈnämənəlˌizəm/Definition of phenomenalism noun Philosophy the doctrine that human knowledge is confined to or founded on the realities or appearances presented to the senses. Derivatives phenomenalist noun & adjective phenomenalisticPronunciation: /-ˌnämənəlˈistik/ adjective phenomenalism in other Oxford dictionaries Definition of phenomenalism in the British & World English dictionary