hallucination Syllabification: (hal·lu·ci·na·tion)Pronunciation: /həˌlo͞osənˈāSHən/Translate hallucination | into French | into German | into Italian | into Spanish Definition of hallucination noun an experience involving the apparent perception of something not present:he continued to suffer from horrific hallucinationshallucination in other Oxford dictionaries Definition of hallucination in the British & World English dictionary