Main Entry: il·lu·sion

Pronunciation: \il-ˈü-zhən\

Function: noun

1 : a misleading image presented as a visual stimulus
2 a : perception of something objectively existing in such a way as to cause misinterpretation of its actual nature ; especially : optical illusion—compare delusion 2 b : hallucination 1 c : a pattern capable of reversible perspective

—il·lu·sion·al \-ˈüzh-nəl, -ən-^əl\ adjective