ˌkʌnd͡ʒəˈɹeɪʃən dɪˈsɛpʃən dɪˈl(j)uːʒ(ə)n ˈfæntəsi ɪˈl(j)uːʒ(ə)n ˌlɛdʒ.ə.dɨˈmeɪn ˈlɛdʒ.əɹ.dəˌmeɪn ˈmadʒɪk ˈmædʒɪk ˈsɛm.bləns ˈθɔːmətɜːdʒi ˈθɔməˌtɜɹdʒi tɹɪk an illusory feat; considered magical by naive observers the act of deluding; deception by creating illusory ideas She has a delusion that she is being spied on. something many people believe that is false they have the illusion that I am very wealthy He fancies himself to be a local celebrity. an erroneous mental representation Artists use perspective in art to create an illusion of depth.